For the life of me , I couldn't remember her name.

我怎么也记不起她的名字了.

《简明英汉词典》

I can't for the life of me understand why you didn't think of it.

我无论如何也无法理解你为什么没想到这个。

柯林斯例句

For the life of me, I can't solve this puzzle.

就是要了我的命, 我也无法解出这一难题.

辞典例句

I could not understand it for the life of me.

我无论如何也弄不懂.

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I cannot for the life of me remember her name.

我怎麽也想不起她的名字.

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I can not go back on your friends for the life of me.

无论如何我都不能背弃你的朋友.

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