There are many kinds of machines. They are used in many different ways. One kind of machine is called computer. Computers can do many things. They can do math problems. People can do math problems, too, but they cannot do them faster than a computer. Computers remember things. Computers remember everything people tell them. People cannot remember as many things as computers do. Computers help tell what the weather will be like. Computers help fly rockets and spaceships. Computers are very useful in our daily lives. But how to look after them? ● Keep your computer in a cool, dry room. Too much or too little heat is bad for computers. Damp(潮湿) is also bad for them. ● Do not let people smoke near your computer. Smoke of all kinds is very bad for many parts of a computer. ● Do not eat or drink when you are near your computer. Pieces of food and a little water in the keyboard are also bad for a computer. ● Keep your screen clean and do not have it too bright. They are bad for your eyes. Make sure the screen is not too far from or too near your eyes. Some people use different glasses to protect their eyes when they use a computer.