In order to deceive an enemy, one must also deceive friends.のことですが、Keep your enemy closer than your friends.(Keep your friends close and your enemies closer.) のような言い方のほうが、一般的です。8:12
http://www.youtube.com/watch?v=91WFTA6iVkQ mafia god who makes it a rule to keeping his friends close, and his enemies even closer 敵を欺くにはまず味方からを実践しているマフィアのボス
https://www.youtube.com/watch?v=5i1NBFOQOCw 16:59 as Sun Tzu said keep your friends close and your enemies closer. 孫子曰く、「敵を欺くには味方から」だ。
https://www.youtube.com/watch?v=b8Md7QrxNeE 2:15 keep your enemies close.
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練習問題解答
b-3929 keep your friends close and keep your enemies closer
