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Compass(指南针）
这一段是讲用途及做法的的：
The compass is an instrument of navigation. (罗盘是航行仪器。)By the 15th century, wooden ships had grown larger. New instruments such as compasses helped sailors navigate, or guide, their ships. Ships began to carry cannons to shoot at other ships.In the 1200s, sailors learned how to make a compass that could help them find their way at sea. They made a needle from a thin piece of lodestone or iron. They hung the needle from a string. The needle always pointed north. Because Earth is a big magnet, the south pole of the compass needle always points toward the magnetic North Pole of Earth. Remember, the south pole of one magnet always pulls toward the north pole of another magnet. This works whether the magnet is as small as a needle or as big as a planet.
指南针的发明时间与发明人：
China gave the world many famous inventions.
For example,The Chinese invented the first compass.Nearly two thousand years have passed since our ancestors invented the compas