每日商务英语 第601期:确定无疑之事

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mortal-lock cinch ---------- 确定无疑之事（非正式）

英文释义
(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.
不管我的天才女儿决定她这辈子做什么，她都确定无疑会成功的。