Have you ever noticed tiny raised areas on the branches of a tree? These may have been insects. These small insects feed on tree sap (汁液). Insects on urban trees are notably more abundant than those on rural trees. As a result, urban trees suffer from heavy infestations (害虫横行), and are often unhealthy or die. To protect and restore urban trees' health, we need to determine the factors that make these tree pests more successful in urban habitats.

    Living organisms interact closely with their environment. The warmer, more drought-stressed trees harbor more successful pests than cooler, less drought-stressed trees. As cities and natural habitats become hotter and drier, damaging insects will become more abundant on urban trees.

    Trees within urban forests are valuable economically and for the environmental sustainability (可持续性) of the region. More than half of the world's population lives in cities. Across the globe, people are moving into cities at a faster rate than ever. Rapid growth may turn cities into places with harder conditions. Although cities are primarily made of buildings, roads, parking lots, and vehicles, there are still plants in them. The trees within a city are referred to as the urban forest. Urban forests offer very big benefits to human and environmental health. They improve air and water quality, provide habitat for wildlife, cool down temperatures and beautify our environment. They make cities livable.

    However, being a city tree is not easy. Heat released by human activities is trapped in cities. As a result, temperatures in urban areas are often warmer than their surrounding rural areas. We call this urban warming or the urban heat island effect. Urban habitats are mostly made of surfaces of asphalt (沥青) and concrete. These surfaces reduce the amount of rainwater that reaches tree roots. As a result, urban forests may suffer, which can negatively affect people and the environment.

    What can we do to restore urban forests? Regular irrigation when possible may help keep pest populations under control. Planting tree species that are suitable to handle heat and drought stress would also reduce the occurrence of insect pest outbreaks.

    Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood.

    Unluckily, in many parts of the world, man has not found that the third of these points is the most important. Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And also, he is usually too careless to plant and look after new trees. So the forests slowly disappear.

    This does not only mean that man will have fewer trees. The results are even worse: for where there are trees, their roots break up soil-make the rain in-and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing is left but useless desert.

    At a daycare center in Texas, children were playing outside. One of the children was Jessica Mc Clure. She was 18 months old. Her mother, who worked at the daycare center, was watching the children. Suddenly Jessica fell and disappeared. Jessica's mother screamed and ran to her.

    A well was in the yard of the center. The well was only eight inches across and a rock always covered it. But children had moved the rock. When Jessica fell, she fell right into the well.

    Jessica's mother reached inside the well, but she couldn't feel Jessica. She dialed 911 for help. Men from the fire department arrived. They discovered that Jessica was about 20 feet down in the well. For the next hour the men talked and planned Jessica's rescue.

    "We can't go down into the well," they said."It's too narrow. So, we're going to drill a hole next to the well. Then we'll drill a tunnel across to Jessica. When we reach her, we'll bring her through the tunnel and up through our hole."

    The men began to drill the hole at 11 a.m. on Wednesday, October 14, 1987. The men had a difficult job; they were drilling through solid rock. During her days in the well, Jessica sometimes asked for her mother. Sometimes she slept, sometimes she cried and sometimes she sang.

    All over the world, people waited for news of Jessica. Everyone worried about her.

At 8 p.m. on Friday, October 16, men reached Jessica and brought her up from the well. She was soon sent to hospital. Jessica was dirty, hungry, thirsty and tired. Her feet and forehead were badly injured. But Jessica was alive.

    After Jessica's rescue, one of the rescuers made a metal cover for the well, saying," To Jessica, with love from all of us."

    Camping is a good way to spend time along with your kids and to show them how wonderful nature can be. Through camping, children can discover new things about nature, such as flowers, birds, and other small animals. Camping gives kids time to get away from all the electronics (电子) of today's culture. So it is necessary to plan exciting and enjoyable family camping trips with your children while they are young.

    When planning your family camping trip, consider the activities your kids like: games, hiking, swimming, boating, bicycling, etc. Select a camping place that has some of the activities the kids are interested in. Meal planning is an important part of your camping trip. Plan the meals together, and kids love to choose what they want to eat.

    When starting to pack for your trip, let the kids pack their own items (物品) . Each person should have his/her own sleeping bag with a luggage (行李) bag to put it in. Personal items should be packed with their sleeping bags. Encourage the kids to put their items in a certain place and always return it when they have finished using it.

    When you have arrived at your campsite, make all the camping activities a family activity, which will help children to realize how important team-work is. Everyone can have his/her own job sitting up the campsite. Meal time can be a fun time. So let the older ones help with the cooking on your outdoor camping stove while the younger ones get the picnic table ready.

    It is a live celebration of the lasting power of letter writing!

    Letters Live, which started in December 2013, was held at the Freemasons' Hall in London from March 10 to 15. The show invited various great performers who read remarkable letters that had been written around the world over the centuries.

    "Bringing letters alive through outstanding performances is one of the most powerful ways in which the joy and pain and humor and tragedy of being human can be shared," Jamie Byng, managing director of Canongate Books publishing firm, told the Nowness video channel.

    British actor Benedict Cumberbatch agreed. "Letters are windows into the love, beauty, pain and humor of their creators and receivers," he told The Guardian. "Letters Live makes us stop and imagine the lives behind the letters read and where they came from. It's a great honor to read this most ancient of communications live to an audience."

    This year, the movie Sherlock star treated the audience by playing the part of a 17-year Tom Hanks. He put on the young actor's voice when he read his letter to the Hollywood director George Roy Hill, a letter that urged Hill to "discover" him. The letter showed that two-time Oscar winner Hanks' teenage dream was not to "be a big-time Hollywood superstar" but to one day own a Porsche car and call his favorite US actor Robert Redford his nickname "Bob".

    Other famous faces at the event included Carey Mulligan, who played a fictional laundry worker, a female activist fighting for women's rights in the 2015 movie Suffragette. The British actress once again played the role of a suffragette (女权主义者), when she read a very enthusiastic letter demanding the vote for women. The suffragette sent a precious 1913 note to The Daily Telegraph newspaper.

    “Everyone seems to agree upon the necessity of putting a stop to Suffragist anger, but no one seems certain how to do so, " Mulligan read out. "There are two, and only two, ways in which this can be done. Both will be effectual. One, kill every woman in the UK. Two, give women the vote."

    When I was a kid, I was the girl who kept the training wheels on my bike as long as possible. Even my younger sister had got rid of them much earlier than me. But as I began to grow older, this changed.

    All this happened on the Bike Safety Day. It is supposed to be a fun day at school when all of us kids bring our bikes to school and the school provides us with the opportunity to ride outside and learn proper bike safety. Sounds like fun, right? No. In fact, it caused me to panic. What was I going to say when my friends asked me about my training wheels?

    With the pressure of everyone seeing my training wheels, I determined to let them go. This was the first big change I'd ever made on my own.

    I went to my parents and told them all about my dilemma. They were more than happy to help. We went outside and got my bike. Instead of running away and hiding behind, I stood in front of my bike and took great pride in my decision as my dad removed the training wheels.

    I got on and steadied myself. My heart raced but my feet and hands were calm. My dad started to push before my feet even moved and suddenly I was off. The fear faded away and a relaxed mind came into its place. It was crazy to think how quickly I learned something that took so long for me to even try!

    My confidence soared. This was going to be the start of a brand new world for me. My accomplishment would carry me forth to new goals and wins. I realized that if I set my mind to something, I could achieve it.