Pretending he doesn't remember is an old trick of his.假装不记得是他的老花招了。He used the old trick of attacking in order to defend himself.他使用以攻为守的老把戏为自己辩护。It's an old trick but it just might work.这是个老掉牙的把戏了，不过也许会有用。I can't believe you fell for that old trick.我无法相信你被那种老把戏骗了。