dǎ / gǔ / de / shíhòu / yào / gēn / shàng / pāi / zi / , / bù / néng / hū / kuài / hū / màn / .

打鼓的时候要跟上拍子，不能忽快忽慢。

You need to keep up with the beat when playing the drum, and the tempo should not fluctuate randomly.