1.mushroom into 迅速发展成为
例句:There are now thousands of online classes available on the World Wide Web and that number will soon mushroom into tens of thousands.
如今,环球网上开设了成百上千的在线课程,数字很快就会增加到成千上万 。
2.work together 一起工作,共同努力
例句:We work together in harness for the president.
我们都是总统的马前卒 。
3.have sb. do sth. 让某人做某事
例句:He has me give him the book.
他让我把这本书给他 。
4.field trip 实地考察旅行,野外旅游
例句:Are you going to have a field trip on Tuesday?
你准备星期二去野外旅行吗?
adj. 可用的,可得到的,有用的,有效的