keep it under raps保密
keep someone under observation注意观察
keep sth under review不断复查某事物
Keep theory under control讲述理论要适度
Keep Components under 25K保证组件在25K以下;单个数据对象小于;包管组件在25K以下
keep it under wraps把
keep quiet under constraint被迫保持沉默
keep oneself under control悠着点儿
keep dogs under control管住狗
V（动词） to remain or cause to remain below (a surface) 保持在(面的)下面; 引发保持在(面的)下面