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1·He was as cunning as a fox.

他像狐狸一样狡猾。《牛津词典》

2·He is as cunning as a fox.

他象狐狸一样狡猾。

3·You have to be as cunning as a fox to outwit me.

狐狸的狡猾是出了名的，英文看来它也是可以成精的。

4·As insidious as the serpent, camouflage talent: as cunning as a fox.

像毒蛇一样阴险，伪装天赋：像狐狸一样狡猾。