“Community” is not a concept that is easy to define (定义) . In this essay I will examine what turns individuals into a community, and discuss some different types. I will also look at what all communities have in common, the benefits they offer and draw conclusions about their increasing importance.

    The word “community” may make you think of traditional communities in the developing world, where large families live together. We may also imagine the neighbours as people who are happy to help out whenever it is needed. The stereotpical(老套的) view is that of a village, where people have little but can feel very rich because everyone takes responsibility for the welfare of the others.

    On the other hand, there are other types of communities: ultramodern(超现代的) ones, where the community members are unlikely to have actually met each other. These are online communities, where people blog or chat about particular issues that are important to them. They come across others on websites and may develop a relationship there with like-minded people, discussing the same topics. The view is often that these are artificial connections between people who are, in effect, still isolated(孤立的) strangers.

    In reality, the connections are real. Moreover, there are many types of communities in between these extremes: people who join clubs, who sign up with voluntary, political or other organizations, or who take part in group discussions in their local area. They may be campaigning about issues or simply getting together for companionship and support.

    Human beings are social by nature, so it should not be a surprise that we organize ourselves in groups. However, there is more going on: these groups provide something that we cannot achieve on our own. The main benefit of being part of a larger group is strength in numbers. For example, we can access and share more information, we can take part in team sports, we can complain and campaign more effectively and even if we are just having a chat, online or in person, we can feel supported in whatever we do.

    Whatever forms communities take, what defines them is the sense of identity and safety that they provide for their members: the knowledge that there are people who we have something in common with and who can be relied on when we need each other.

    Sydney Trains is one of the most economical, reliable and convenient ways to travel throughout Sydney and its surrounds.

    Our network, the NSW Trains Intercity, covers suburban Sydney and extends to the Hunter, Central Coast, Blue Mountains, Southern Highlands and South Coast regions.

    The network is made up of several colour-coded lines. Trains from different lines can share the same platform, so check display screen and listen to announcements.

    Ticket prices are generally based on the distance traveled. You can visit Transportnsw.Info for details.

    Getting to the City

    In Sydney, if you're near a train station, you're on your way to the city. Every rail line leads directly or indirectly to the City Circle. It's the loop around the central business district of Sydney. Most City stations are underground so look out for the sign on street level.

    Automatic ticket gates

    Large stations have automatic gates for entry to, and exit from, the station. If you have an Opal card or a ticket which has a magnetic stripe (磁条) you must use the automatic gates. You may use the wide gate for wheelchair, pram or luggage access. Station staff will assist you.

    Night Ride buses

    Most trains do not operate between midnight and 4:00 a.m. For your convenience a special Night Ride bus service is available between these hours on most Sydney suburban lines.

    Track work

    In order for the tracks to the maintained, we sometimes have to replace train with buses, particularly at weekends. Please check the track work section for the latest service changes on your line.

    Young people and older people do not always agree. They sometimes have different ideas about living, working and playing. But in one special program in New York State, adults and teenagers live together in a friendly way.

    Each summer 200 teenagers and 50 adults live together for eight weeks as members of a special work group. Everyone works several hours each day. They do so not just to keep busy but to find meaning and fun in work. Some teenagers work in the forests or on the farms near the village. Some learn to make things like tables and chairs and to build houses. The adults teach them these skills.

    There are several free hours each day. Weekends are free, too. During the free hours some of the teenagers learn photo-taking or drawing. Others sit around and talk or sing. Each teenager chooses his own way to pass his free time.

    When people live together, they should have rules. In this program the teenagers and the adults make the rules together. If someone breaks a rule, the problem goes before the whole group. They talk about it and ask, “Why did it happen? What should we do about it?”

    One of the teenagers has said something about it, “You have to stop thinking only about yourself. You learn how to think about the group.”

    About three decades ago, China was known as the "Bicycle Kingdom". But later on, bikes were replaced by their fuel-powered competitors.

    But recent months have seen a recovery of the humble bike across China, with an increasing number of people choosing cycling instead of driving to schools, to workplaces or to do sightseeing. The introduction of bike-sharing schemes, pioneered by start-ups like Ofo and Mobike, has brought the trend to a new level.

    People can unlock the shared bikes by simply using their smartphone. The bikes are equipped with GPS and can be left anywhere in public for the next user. They're popular among many Chinese people as they provide an effective solution to the "last mile" problem, which refers to the final leg of a person's journey.

    " In places where the subway doesn't extend, where it's difficult to change from one kind of transport to another, it's so easy to get where you want to go with Mobike," Hu Hong,29,told AFP. She pedals(骑车)to her Shanghai real-estate job.

    However, the schemes have also led to problems such as illegal parking, vandalism(故意毁坏) and theft. Last month, two nurses in Beijing were placed under administrative punishment for five days for putting locks on two shared bikes. And in December, a man who stole a shared bike was sentenced to a 3-month detention(拘留),and fined 1 ,000 yuan by the Shanghai Minhang People's Court.

    " Bike-sharing is a greener method of transportation and provides a user-friendly experience,"said Liu Xiaoming, vice-minister of transport.

    " But it's a combination of online and offline business. Operators are usually strong in online services, but lack offline business experience, which causes problems."

    Now, Chinese service operators are trying to solve the problems. For example, a bike- sharing company called Mobike sets a 100-point credit score for each user, with points taken in the case of bad behavior. Once a score drops below 80, bike rental is increased to 100 yuan per 30 minutes, up from 0.5 - 1 yuan.

    LOS ANGELES, Nov. 12 (Xinhua)—Legendary comic book writer Stan Lee has died at the age of 95, according to media reports on Monday.

    Lee, born in Stanley Lieber on Dec. 28, 1922, began his career in 1939 and joined the Marvel Comics in 1961.

    He is considered as one of the most legendary names in the history of comic books and the leading creative force behind the rise of Marvel Comics. He co-created iconic fictional characters such as Spider-Man, X-Men, the Avengers, and many more.

    Lee's characters often have super powers, but they also have weaknesses. They were humans, not gods. They not only struggled to save the world, but also to pay their bills, make friends, and hold jobs. This made Marvel comic book heroes stand apart from its competitor DC, which produced the seemingly perfect heroes like Superman and Wonder Woman. Those superheroes have been adapted into blockbuster films, most of which were made after Disney acquired Marvel in a 4-billion-dollar deal in 2009.

    In a statement, Bob Iger, chairman and CEO of the Walt Disney Company said Stan Lee was as extraordinary as the characters he created.

Marvel also praised Lee on its website by putting on one of Lee's famous quotes, which goes, "I used to be embarrassed because I was just a comic-book writer while other people were building bridges or going on to medical careers. And then I began to realize: entertainment is one of the most important things in people's lives. Without it, they might go off the deep end. I feel that if you're able to entertain, you're doing a good thing. "

Praise from his Hollywood peers and colleagues was generous. President of Marvel Studios Kevin Feige appreciated Lee's unparalleled impact on the industry. "No one has had more of an impact on my career than Stan Lee, " Feige said. "Our thoughts are with his family and the millions of fans who have been forever touched by Stan's genius, charisma and heart. "

Learn to cure cancer

    A vaccine for cancer is in the works.

    Lauren Landry and Chloe Tomblin are the scientists. They look in freezers(冰柜) for bacteria to use in the research. This research has its limitations—mostly because their lab is in a high school.

    But Lauren, 16, and Chloe,17 both students are Western Reserve Academy in the US, aren't put off by the difficulties they face in their cancer immunology(免疫学) class.

    “I hope we get to the point where we can get to a vaccine and write a paper,” Lauren said.

    Both conduct research into how to engage the immune system in stopping cancer from forming.

    Though the lab is in a high school, they don't use textbooks. The aim is to conduct real cancer research, either by testing the effects of substances on cancer cells or developing vaccines to target the growth of those harmful cells.

    The idea for the class came from Robert Aguilar, who has taught at the private school for many years. Students spend the first year learning research techniques. In the second year, students swap(调换) their blue lab coats for white ones. By this stage they are well into their research projects.

    “If first-years need any help, they can feel free to ask second-year students,” Aguilar said.

    Students form groups to conduct their research. One pair of students has researched the effect of capsaicin(辣椒素) on killing cancer cells. Another has tested the effect of caffeine(咖啡因) on the growth rate of breast cancer(乳腺癌) cells.

But few students get to the point in their research of experimentation with mice, Aguilar said. Lauren and Chloe hope that they can make decent progress in their work.

    “We know they're going to be used for good,” Lauren said. “If it does or doesn't work, it still has a huge impact.”

    Aguilar teaches the students that even research that doesn't work still contributes to science in some way. He tells students that “the best part of research is failing a lot”.