对某事不清楚
Be unclear about STH
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果你对某事不清楚，你应该问他。
If you're not clear about something, you should ask him about it.
youdao
but also very non-affrontively, express a lack of complete knowledge
又不冒犯地表达对某事不完全清楚，
I don't know 课堂 - SpeakingMax英语口语达人
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