Unit 3 Inventors and inventions
核心单词
1. distinguish
vi.&vt. 显示¡¡的差别；使¡¡有所不同；辨别（常与from, between连用）；区别；区分
I can distinguish them at a distance.
从远处我就能认出他们。
The man distinguishes himself by his wisdom.
这个人因他的才智而扬名。
常用结构：
distinguish A from B 辨别A与B
be distinguished from 不同于¡¡
be distinguished by 以¡¡为特征
be distinguished for 因¡¡而著称
distinguish oneself 使出众；使著名
高手过招
(1)单项填空
It is not easy to cultured pearls from genuine pearls.
