clacking

he will sit clacking for hours.

他会坐着大声唠叨个几小时。

Stop clacking your pencils!

别弄得铅笔噼啪乱！

There was a large, low-ceiled room, with clacking, rattling machines at which men in white shirt sleeves and blue gingham aprons were working.

个天棚很低的大间，里面排列着发声的机器。