她用一块布擦窗子。

She rubbed the window with a cloth.

快要爬到窗口时，下面一个人用讽刺的口吻说：“我看不必在夜里这个时候擦窗子吧。” 我向下面看去。

I was almost there when a sarcastic voice below said, 'I don't think the windows need cleaning at this time of the night.