士兵们以稳定的节奏敲打着他们的鼓。

The soldiers ___beat their drums in a steady rhythm.

我们能听到鸽子用翅膀拍打着玻璃。

We could hear the pigeons ___beat their wings against the glass.

大雨敲打着石板屋顶。

The heavy rain ___beat against the slate roof.