New Words：

chief [tʃi:f]
adj.最重要的；首要的；主要的；最高级别的
n.首领 ；最高领导人；<口>上司，头头

Sample Sentences：

What are the chief rivers of China?
Smoking is one of the chief causes of lung cancer.
The chief guest appeared at 11 o'clock, when the party was over.
He had the good fortune to marry off his daughter to the local chief.

fortune ['fɔ:tʃən] n. 命运；运气

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