他给我做的大多数译文完全不知所云。
Most of the translation he did for me was complete nonsense.
大概15年前我来过这里，当时我完全不知所云。
I was here 15 years ago or something. You know, I had no idea what I was doing.
可偏偏我只懂西班牙语一门外语，她说的我完全不知所云。
Unfortunately, I had confined my foreign language studies to Spanish, and I didn't understand a word.
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