lack在这是名词， lack of 是缺乏， a lack of 没这种搭配

（常与of连用）缺乏；需要

There is no lack of vegetable.

蔬菜不缺。

The lack of rain aggravated the serious lack of food.

由于干旱少雨,缺粮问题更加严重。

It was lack of current capital that defeated their business.

因为缺少流动资本,他们的企业才告失败。

Serious lack of circulating fund forced the closure of the company.

公司因缺严重乏流动资金而被迫关闭。