Do you like drinking coke, coffee, juice or milk? Do you often drink them instead of water? However, of all the things we eat and drink, water is the most important. Not all of us understand this but it is quite true. Human body can go without food for a long time, but two or three days without water usually makes people die.

    Many people do not understand how much water the human body needs to work well. What is true is that many people do not drink enough, especially in hot weather. Most people drink only when they are thirsty but often need more water after they take exercise.

    Does anyone know what is the 65%-75% of human body? It is water. If we do not have enough water, we will feel tired and become ill. So, do you know what the best drink is? It's water.

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    American Sign Language, often called ASL, is used by most people with hearing problems in the United States and Canada.

    Besides ASL, there are more than fifty sign languages used throughout the world today, including Mayan Sign, British Sign, Israeli Sign, and Chinese Sign. Like spoken languages, sign languages are different from each other. But all sign languages are based on sight instead of sounds.

    Sign languages have several main visual (视觉) parts that work together to express meaning. The first part is the shape made by the hands. Movement is also important. Moving the body or organs (器官) like hands affects the meaning of the shape. The place where the sign is made and the direction the hands face are crucial as well. Other visual clues (线索), such as the expression on a person's face, can sometimes change a sign's meaning. For example, a change in a smile can show whether a signer is happy, very happy, or overjoyed. Raising the eyebrows can mark a question.

    In sign languages, the visual parts are combined (结合) in different ways to create signs.

These signs stand for things, actions, feelings, and ideas. ASL has about 4,000 different signs. Like spoken  languages,  sign  languages  cannot  be  translated  word-for-word.  

    For English word may be represented by a series of signs in ASL. Or several English words may be

represented by a single ASL sign. Unlike spoken languages, the signs are organized according to sign-language grammar and the most important word or idea is signed first.

    In ASL, the letter signs are made with one hand. Signers would rarely, if ever, spell out all the words they are signing. That would be as awkward and slow as speakers spelling each spoken word. However, American Sign Language does not have signs for proper names, so signers may use the alphabet to spell these. Also, sign languages often borrow words from other languages. They may spell words using finger spelling which is done with a set of hand shapes that stand for letters of the alphabet.

    Sign languages  develop  naturally  when  people  with  shared  culture  and  needs  want  to communicate with each other. Signers are closely linked to each other, perhaps more than to speaking people in their own communities. Signers share points of view, values, needs, and problems,as well as languages.

    Tablets are really useful devices, but their big screens always make them as a burden to carry around without a bag. Wouldn't it be great if there were a phone with the powers of a tablet that could be folded up and fit into the hand?

Now something like a tablet-shaped but foldable phone is about to become available. In February, South Korean electronics company Samsung and China's Huawei both showed foldable phones, The Galaxy Fold and Huawei Mate X respectively. Mobile phone use has entered the "foldable future", The Verge noted.

    The technology could change our lives in unusual ways. These devices, due to their foldable screens, give us the larger screens we want. At the same time, they still fit easily into the pocket. As USA Today noted, they're "the combination of a small tablet and smartphone, all in a single device".

    The technology could change other devices too. For example, we could make TVs that stick to walls like posters, or fold up easily to hide away in drawers. In crowded modern cities, they will help us to make full use of available space.

    In a keynote speech, Samsung's senior vice president of mobile product marketing, Justin Denison, called the foldable screen "the foundation for the smartphone of tomorrow". "It's a piece of white paper for us to paint something beautiful on together," he said.

    So is there nothing to stand in the way of the foldable future?

According to technology news website Android Authority, the necessary displays* were difficult to produce. At present, these foldable devices cost too much. For example, the price of Huawei Mate X is 17,500 RMB. That's a price that few people will be able to afford.

    But if the foldable device isn't going to change the world overnight, there is no doubt that it is coming.

    Patrick Moorhead, an industry expert told The Verge, "Few are debating if foldable mobile displays are the future of smartphones; the only question is when and by whom."

    Get a lot of letters at this time of year from people complaining (抱怨) that they have a cold and that it won't go away. There are so many ways to cure (治愈) a child. It is often difficult to know what to do. Although (尽管) cold are rarely (很少) dangerous, weak people , such as the elderly or young babies, often catch them. Colds are always uncomfortable and sometimes very unpleasant. Of course, you can buy lots of medicine. This will help to make your cold less unpleasant, but you must remember that nothing can actually cure a cold or make it go away quickly.

    Another thing is that any medicine can be dangerous if you are already taking another type of medicine for some other illness. So always check with your chemist (药剂师) or doctor to see if they are all right for you. Also, remember that they might make you sleepy; please don't try to drive it they do! Lastly, if you want to keep away from colds, don't blindly (盲目地) believe in 'magic' foods or drinks. The best way is to keep strong and healthy –you'll have less chance of catching a cold, and if you do, it shouldn't be so bad!