A patter is a series of quick, quiet, tapping sounds.
例句
...the patter of the driving rain on the roof.暴雨打在屋顶上发出的啪嗒声
N-SING
（通常以娱乐、推销或劝说为目的的）顺口溜，伶俐话，连珠炮似的叫卖语
Someone's patter is a series of things that they say quickly and easily, usually in order to entertain people or to persuade them to buy or do something.