He muffed his opening speech.

他的開幕講話搞砸了。

柯林斯例句

He muffed a good opportunity for a big contract.

他把簽訂一項大合同的好機會錯過了.

辭典例句

I had a chance to impress her with my efficiency and I muffed it up.

我本來有機會使她了解我的辦事效率,但是我錯過了這個機會.

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