1 lack,vt,直接加宾语,He lacks confidence to write in English.\x0dlack,也有vi的时候,这时一般是lack in+宾语,he is lacking in money.\x0d2 a lack of,一般泛指的时候用,lack,n,缺乏;\x0dthere is a lack of...缺乏,\x0d3 lack of,一般前面都会有限定词的,再有就是固定搭配,前面不用a,如lack of water.\x0dHe can not buy it because of (his) lack of money.他因缺钱买不起这个;\x0d(Habitual) lack of care.习惯性的缺乏关心;\x0d(The) lack of rain made...雨水的缺乏使得...这里用the来限定了.