单词20 (2-2)

1.在表示：人的缺点，设计制造方面的缺点或诚陷时，名词 defead和 deficirenay的词义相近。phaysiologial defectideficiency 生理缺陷

Thenew car had to be withdrawn from the maket because of a mechanical defect

2.但表示‘缺少，不足’(shaortage时，只可用deficiency.

During the war, children sulfered from a deficveny of food.

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