它看起来很硬，我可以用它来给我自己做一个鼓面。

It looks very tough and I can use it to make myself a drumhead.

驴瘸了，被卖给一个想用驴皮当鼓面的人。

The Donkey becomes lame and is sold to a man who wants to use his skin for a drumhead.

举例来说，对于模拟鼓声，将有一个公式阐明敲击鼓面加添能量到二维的膜。

For example, to model the sound of a drum, there would be a formula for how striking the drumhead injects energy into a two dimensional membrane.