be after寻找;寻求 = chase after = pursuebe to do应当做某事 = be supposed to doarise from由…引起,起因于 = result frombreak away from 挣脱,逃离 = escapebreak into 破门而入break in非法侵入 = invadebreak out爆发;突然发生 break up崩溃;分离;解散;结业,分手 bring up养育;提起...,谈到 bump into无意中遇到、碰到 = run into = come across