字母N、S、E和W分别代表北、南、东和西。
The letters N, S, E and W stand for north, south, east and west.
今日的科学时刻，东和y将谈论如何解释这种行为。
In this Moment of Science Don and yael discuss one explanation for this behavior.
B奥运会场将遍及全北京——北、南、东和西——但是主会场在北部。
B the Olympics will be all over Beijing - north, south, east and west - but the main centre is in the north.
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