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重点讲解：
1. at once 同时；一起；
例句：The teacher asked the pupils not to speak at once.
老师叫学生们不要同时说话。
2. differentiate from 使有差别；使不同；
例句：I can't differentiate one variety from another.
我无法将这几个品种区别开来。
3. take advantage of 利用；占……的便宜；
例句：It never occurred to me to take advantage of him.
我决没有想到过要占他的便宜。
4. in turn 继而；转而；反过来；
例句：That, in turn, would be useful in reconfigurable circuits.
反过来,通过改变电路也一样有作用。
vt. 识别，使差异，求导数，区分，区别对待
