分析如下:一、lack 有两种用法:1、及物动词,“缺少;缺乏”的意思,后面直接跟宾语。He just lacks a little confidence. (他就缺少点信心。)What we lack in this house is space to store things. (在这房间里我们所缺的是存放东西的空间。) 2、名词,“短缺”,通常用于这个短语 lack of...中,表示“……的短缺”。如:Her only problem is a lack of confidence. (她唯一的问题是缺乏信心。)Lack of sleep had made him irritable. (睡眠的缺乏使他烦躁不安。...