pound|pounded

一磅大约等于454克。

One ___pound is approximately equal to 454 grams.

我妈妈想买一磅肉来做晚餐。

My mum wants to buy a ___pound of meat for dinner.

他砰砰地敲门，要求让他进去。

He ___pounded on the door demanding to be let in.