Lack缺乏,没有
Lack+of＋名词：The plants died for lack of water.
Lack+名词：We lack the strength to walk any further.
短语：be lacking:欠缺、缺：Money was lacking to complete the building.
Be lacking in缺乏（某种品质、特点等）,不够：He is not lacking in intelligence.
Lack for 缺（多用于否定句） She does not lack for friends.