他掌握一项自己引以为傲的技能。

他掌握一项自己引以为傲的技能。

He has a skill of which he is very proud.

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He has a skill of which he is very proud.

of which 是介词 of 与 which 的组合,which 指代 a skill。of 来自形容词 proud 的搭配 (be proud of),前置 which 使表达正式。非正式说法为 a skill which he is very proud of。

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