问题描述： lack of sth 和 a lack of 的区别最好用例句说明一下 1个回答 分类：英语 2014-12-13 问题解答： 我来补答 lack of sth 缺乏The flowers are wilting for lack of water、a lack of 缺少 形容词 Stress and tiredness often result in a lack of concentration. 展开全文阅读
