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重点讲解：
1. belong to 是（某族类或纲目）的一部分；属于；
Lions and tigers belong to the cat family.
狮子和老虎属于猫科。
2. be adept at 熟练的；擅长的；内行的；
He is adept at getting himself out of difficult situations.
他善于使自己摆脱困境。
3. derive from/be derived from 从…衍生出；起源于；来自；
The word Easter derives from Eostre, the pagan goddess of spring.
Easter（复活节）一词由Eostre（多神教的春天女神）衍生而来。
4. sniff at 闻；嗅；
The dog sniffed at my shoes.
那条狗嗅我的鞋。
adj. 否定的，负的，消极的
n. 底片，负
