It is a tall tale（夸张的故事）that terrifies most young children. Swallow a piece of chewing gum and it will remain in your body for seven years before it is digested. An even worse tale is that swallowed（吞） gum can wrap itself around your heart.

    But what does happen if you should accidentally eat a stick of gum? Chewing gum is made out of gum base, sweeteners, coloring and flavoring. The gum base is pretty indigestible(难消化的)—it is a mixture of different ingredients (成分) that our body can't absorb.

    Most of the time, your stomach really cannot break down the gum the way it would break down other foods. However, your digestive system has another way to deal with things you swallow. After all, we eat lots of things that we are unable to fully digest. They keep moving along until they make it all the way through the gut (肠子) and come out at the other end one or two days later.

    The saliva (唾液) in our mouths will make an attempt at digesting chewing gum as soon as we put it in our mouths. It might get through the shell（壳） but many of gum's base ingredients are indigestible. It's then down to our stomach muscles—which contract(收缩) and relax, much like the way an earthworm moves—to slowly force the things that we swallow through our systems.

    Swallowing a huge piece of gum or swallowing many small pieces of gum in a short time can cause a blockage within the digestive system, most often in children, who have a thinner digestive tube than adults—but this is extremely rare.

    Some places in the world have strange laws. It's important for you to know about them before going there.

    Whoever likes to chew gum(口香糖) may have to leave Singapore. The government really wants to keep the city clean and will fine you for chewing gum.

     Before you leave for the United Arab Emirates you'd better make sure you aren't visiting during Ramadan(斋月). During that time you aren't allowed to eat or drink in public. Tourists have been fined up to $275 for drinking in public.

    Lovers spend so much time kissing each other goodbye at train stations that trains often start late. This law— no kissing your lover goodbye at train stations – is rather old, and isn't in use today in France.

In Thailand it's against the law to drive a car or motorcycle without a shirt on, no matter how hot it is. Punishments are different in different areas and can include warnings and tickets costing about $10. No joke — the local police will stop you.

     Studies in Denmark have shown that cars with their headlights on are more noticeable by other drivers than those with their headlights off. Drivers there are required to leave their headlights on even during the day, or they may face a fine up to $100.

    Do you often buy things using coins? Don't do it in Canada. The Currency Law of 1985 doesn't allow using only coins to buy things. Even the use of the dollar-coin is limited (受限制的). The shop owner has the right to choose whether to take your coins or not.

    Make sure you know about these laws before your next trip. Better safe than sorry.

    Have you ever considered all the English expressions that include words about clothes? Let's have a look.

    People wear pants to cover the lower part of their bodies. We sometimes say that people who are nervous have ants in their pants. Sometimes, people may get caught with their pants down. They are found doing something they should not be doing. And, in every family, one person takes control. Sometimes a wife tells her husband what to do. Then we say she wears the pants in the family.

    Pants usually have pockets to hold things. Money that is likely to be spent quickly can burn a hole in your pocket. Sometimes you need a belt to hold up your pants. If you have less money than usual, you may have to tighten your belt.

    I always praise people who can save their money and not spend too much. I really take my hat off to them. Yet, when it comes to my own money, I spend it at the drop of a hat, which means I instantly spend it.

    Boots are a heavy or strong kind of shoes. People who are too big for their boots think they are more important than they really are. I dislike such people.

    My father is an important person. He runs a big company. He wears a suit and tie, and a shirt with sleeves that cover his arms. Some people who do not know him well think he is too serious and never shows his feelings openly. But I know that my father wears his heart on his sleeve.

Eco-Resort Management

    Ecotourism is often regarded as a form of nature-based tourism and has become an important alternative source of tourists. In addition to providing the traditional resort-leisure product, it has been argued that ecotourism resort(度假村) management should have a particular focus on best-practice environmental management. Couran Cove Resort is such a tourist attraction located on South Stradbroke Island, Australia.

    Sustainable(可持续的) Practices of Couran Cove Resort

    South Stradbroke Island is separated from the mainland by the Broadwater, which is home to a wide range of plant communities. Located on the offshore island, the Resort is only accessible by means of water transportation. It provides hourly ferry service from the harbour on the mainland to and from the island. Within the Resort, transport modes include walking trails, bicycle tracks and the beach train. The reception area is the counter of the shop which has not changed in 8 years at least. The accommodation is an octagonal(八角形的) building. These are large rooms that are clean but the equipment is old and in some cases just working. The ceiling fan only works at high speed for example. Beds are hard but clean. There is a television, a radio, an old air conditioner and a small fridge in each room.

    As an ecotourism-based resort, most of the planning and development of the attraction has been concentrated on the need to co-exist with the natural environment of South Stradbroke Island to achieve sustainable development.

Water and Energy Management

    There is groundwater at the centre of the island, which has a maximum height of 3 metres above sea level. The water supply is recharged by rainfall and is commonly known as an freshwater aquifer(含水层). Couran Cove Island Resort obtains its water supply by tapping into this aquifer and collecting it through a pipe. In order to narrow the water uses, all laundry activities are carried out on the mainland. The Resort uses LPG power station rather than a fuel oil station for its energy supply, supplemented(补充) by wind power, which has reduced greenhouse emissions by 70%. Hot water in the eco-cabins and for some of the Resort's vehicles is solar-powered. Water efficient fittings are also installed in showers and toilets. Visitors who stay at the Resort are encouraged to monitor their water and energy usage by an in-house television system, and are rewarded with prizes (such as a free return trip to the Resort) accordingly if their usage level is low.

    Evaluation

    In three years of operation, Couran Cove Island Resort has won 23 international and national awards. It has effectively implemented contemporary environmental management practices. However, the Resort's growth will eventually be limited by its carrying capacity, and quantity control should be incorporated in the management strategy of the Resort.

    A disastrous fire surrounded Notre Dame(巴黎圣母院)completely and destroyed large parts of the Gothic(哥特式的) architecture on Monday.

    "Notre Dame is our history, our literature; part of our spirit, the place of all our great events, our wars, our liberations, the center of our lives" French President Emmanuel Macron told reporters in front of the still burning Paris landmark and promised to rebuild Notre Dame Cathedral.

    "Notre Dame is burning, and know the sadness and this tremble felt by so many fellow French people. But tonight, I'd like to speak of hope too, "he said, announcing the launch of a fundraising campaign.

    "Let's be proud, because we built this cathedral more than 800 years ago, we've built it and, throughout the centuries, let it grow and improve it. So I gravely say tonight: we will rebuild it together, "he added.

    The disastrous fire engulfed(吞没) the upper reaches of Paris' towering Notre Dame Cathedral as it was undergoing renovations(翻新).

    Tourists and Parisians looked on horrified from the streets below. France's Interior Ministry said firefighters might not be able to save the structure.

    The fire collapsed the cathedrals' spire(尖顶) and spread to one of its landmark towers "Everything is burning; nothing will remain from the frame, "Notre Dame spokesman Andre Finot told French media. The 12th-century cathedral is home to incalculable works of art and is one of the world's most famous tourist attractions, immortalized by Victor Hugo's 1831 novel The Hunchback of Notre Dame.

    The cause of the fire was not known, but French media quoted the Paris fire brigade(消防队) as saying the fire is "potentially linked" to a 6 million—euro($6. 88 million)renovation project on the church's spire and its 250 tons of lead. Officials opened an investigation as Paris police said there were no reported deaths. Some 400 firefighters were battling the fire well into the night.

    You're probably used to the regular upgrades in our cell-phone networks. There was 2G, which came along in 199l, replaced with 3G in 2001, followed by 4G in 2009. Now we're hearing about the coming of 5G.

    But 5G is a much bigger leap than before. 5G, of course, is much faster than 4G in the real world and a 5G phone in a 5G city will enjoy Internet speeds between 9 and 20 times as fast. The arrival of 5G also means enormous leaps forward in capacity－so much that every cell-phone plan will offer cheap, truly unlimited Internet access. "The consequences of that are huge," says Sherif Hanna, Qualcomm's director of 5G marketing. For example, apps will no longer degrade (降低) your video quality or postpone downloading when you're out of Wi-Fi range. In fact, you'll probably prefer to do your downloads when you're on cellular (使用流量) because 5G will be much faster than whatever service you've got at home or work.

    "However, not everyone is excited by the 5G development. The new standard gets its speed partly by using existing transmission(传输) frequencies more efficiently and partly by using the millimeter wave range. That's a big, juicy line of radio frequencies that are currently underused because millimeter wave is really hard to use," Hanna says.

    These frequencies are much higher than anything we've used for the cellular, which means they can offer unbelievable speed－but at the cost of range. Millimeter wave cellular towers have to be about 500 feet apart. Cell carriers not only will have to upgrade all their cell transceivers (called small cells) but will install(安装) a lot more of them as well.

    That's why the millimeter wave flavor of 5G, the superfast coverage, will be available only in densely populated cities such as New York and San Francisco. In suburban and rural areas, 5G will bring a speedup of "only" nine times faster.