New Words：

lack [læk]
v.缺乏；没有；不足；短缺
n.缺乏；短缺；匮乏

Sample Sentences：

Lack of food is one of their worries.
Strong coffee can deal with any lack of sleep.
He can not buy it because of his lack of money.
I think you are lack of exercise, you'd better spend some time on it.

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