二者都是"缺乏……"之意,不同是,前者用作名词成分,后者用作动词。
lack
词性：及物动词，不及物动词，名词
习惯用语
for lack of
解释:
及物动词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
不及物动词vi.
缺少;不足;没有[(+for)]
They lacked for nothing.
他们什么都不缺少。
名词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。
习惯用语
for lack of 因缺乏...; 因无... by lack of 因缺乏...; 因无... from lack of 因缺乏...; 因无... through lack of 因缺乏...; 因无... no lack of 不缺乏, 很多 supply the lack 补缺 lack in 在...缺少[不足]
同根词
词根：lack
adj.
lacking 缺乏的；没有的；不足的
v.
lacking 缺少；不足（lack的ing形式）
vt.缺乏；不足；没有；需要
ask / claim
vi.缺乏；不足；没有
fail / low in
n.缺乏；不足
shortage / short of / deficiency / need / drought
相关例句
lack /læk/ CET4 TEM4 [ lacking lacked lacks ]
1.不可数名词 If there is a lack of something, there is not enough of it or it does not exist at all. 缺乏; 不存在
例：
Despite his lack of experience, he got the job.
尽管缺乏经验，他还是得到了那份工作。
例：
The charges were dropped for lack of evidence.
由于缺少证据，起诉被撤销了。
2.及物动词/不及物动词 If you say that someone or something lacks a particular quality or that a particular quality is lacking in them, you mean that they do not have any or enough of it. 缺乏; 没有
例：
It lacked the power of the Italian cars.
它没有意大利汽车那样的动力。
例：
He lacked the judgment and political acumen for the post of chairman.
他缺少作为主席的判断力和政治敏锐性。
3.
习语 If you say there is no lack of something, you are emphasizing that there is a great deal of it. 不缺某物强调
例：
He said there was no lack of things for them to talk about.
他说他们不缺话题谈。
