1.mushroom into 迅速發展成為
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,環球網上開設了成百上千的在線課程,數字很快就會增加到成千上萬 。
2.work together 一起工作,共同努力
例句:We work together in harness for the president.
我們都是總統的馬前卒 。
3.have sb. do sth. 讓某人做某事
例句:He has me give him the book.
他讓我把這本書給他 。
4.field trip 實地考察旅行,野外旅游
例句:Are you going to have a field trip on Tuesday?
你準備星期二去野外旅行嗎?
adj. 可用的,可得到的,有用的,有效的