A thief knows a thief as a wolf knows a wolf.是什么意思？

A thief knows a thief as a wolf knows a wolf.

贼了解贼,正如狼了解狼。

thief

n. 小偷，盗贼，<口>（使蜡外流的）蜡烛心结的烛花；

例句
She chased the thief for 100 yards...
她追了窃贼100码远。

knows

v. 知道( know的第三人称单数 )，看到过，听到过，经历过；

例句
He loves animals and he knows all about them...
他热爱动物并且对它们了如指掌。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

wolf

n. 狼，贪婪的人，有害的幼虫；vt. 狼吞虎咽；

例句
The wolf clawed at the tree and howled the whole night.
这匹狼用爪子挠着树，嚎叫了整晚。