lack vt.& n．缺乏；缺少； 不足
(教材P49)When there is a lack of food, there is hunger.
当缺少食物时就会有饥饿产生。
(1)(a) lack of... ……的缺少
for lack of sth. 因缺少……
(2)lacking adj. 缺少的；缺乏的
be lacking in 缺少……；……不足
Health problems are closely connected with bad eating habits and a lack of exercise.
健康问题与不良饮食习惯和缺乏运动有密切关系。
