讲解文本：

play dumb 装傻，装聋作哑
dumb 哑的，不能说话的，笨的
Don't play dumb with me, I know you ate the last piece of cake.
别装傻了，我知道是你吃了最后一块蛋糕。
He says he doesn't know it at all, but I know he's just playing dumb.
他说他完全不知道这件事，我知道他只是在装聋作哑。

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