thump

沉重的箱子掉在地上发出闷响。

The heavy box hit the floor with a ___thump.

雨滴轻轻拍打在窗户上，发出嗒嗒的声响。

The raindrops hit the window with a gentle ___thump.

装满书的袋子掉在地上，发出沉闷的响声。

The bag full of books fell to the ground with a loud ___thump.