每日商務英語 第695期:親密無間

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thick as thieves --------- 親密無間的（非正式）

英文釋義
(INFORMAL) Adjective phrase describing a group of people who are closely and often conspiratorially connected.

例句
My two gossipy neighbors are thick as thieves and I will never tell any secrets to either of them because the other will hear about it immediately.
我有兩個親密無間的多嘴鄰居，我不會跟他們中的一個講任何祕密，因爲另外一個人會馬上知道。