每日商務英語 第601期:確定無疑之事

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mortal-lock cinch ---------- 確定無疑之事（非正式）

英文釋義
(INFORMAL) Something that is absolutely certain to happen; a certainty.

例句
Whatever my talented daughter decides to do in her life, it's a mortal-lock cinch she will succeed.
不管我的天才女兒決定她這輩子做什麼，她都確定無疑會成功的。