轻敲

Charlotte rapped on the window with her knuckles.

夏洛特用指节敲着窗户。

Think of the transfixingly strange Scherzo of the Fifth Symphony, when the music effectively stops moving and the timpanist drums lightly on the note C like a finger tapping on a pane.

想想第五交响曲的谐谑曲中奇怪终止的地方，当音乐突然停止时，定音鼓手的敲出C音，就像用手指敲方格一样。