㈠ 表示世上唯一的事物，如：
① the sun; the earth; the sky; the North Pole
㈡ 当一个名词被再次提起时，如：
② A car knocked against a tree. We can still see the mark on the tree made by the car.
㈢ 当名词后面有个修饰作用的短语或分句时，如：
③ The girl in red is my sister.
④ The thief who stole your wallet yesterday was arrested.
㈣ 加在某些形容词前面，以表示某类人或事，如：
⑤ The rich often get richer and the poor, poorer.
⑥ The doctor lost no time in giving help to the injured.
⑦ Don't expect the impossible.
㈤ 加在某些山川、河流、岛屿、国家名称之前，如：
⑧ the Alps; the Thames; the British Isles; the Philippines; the Atlantic Ocean.
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