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zGhf-sxNvBBDz^。
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H~2Vx*lvG^=1o#2SjI[z。
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j&6OnH8Xt6l07|G。
4. sniff at 闻；嗅；
The dog sniffed at my shoes.
那条狗嗅我的鞋i_A5(BsRD2]2_rEbdKZB。