| 单词 | these four walls | 
| 释义 | ● these four ˈwalls used when you are talking about keeping sth secret (用于叮嘱保守秘密)到此为止◆ Don't let this go further than these four walls (= Don't tell anyone else who is not in the room now ). 走出屋外这事就不要再谈了。See also four | 
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