vt.(通常不用于被动语态)

1. 缺少；没有
   I don't seem to lack anything.

   我好像什么也不缺。

2. 需要

vi.

1. 缺少；不足；没有[（+for）]
   They lacked for nothing.

   他们什么都不缺少。

n.

1. 欠缺；不足；没有[U][S1][（+of）]
   He can not buy it because of his lack of money.

   他因缺钱买不起这个。

2. 缺少的东西；需要的东西[C]
   Water is a lack of this region.

   这个地区缺水。

n.

v.