The explosion nearly took his arm off.

他的胳膊差点儿被炸掉。

《牛津词典》

He brought his arm up in a futile attempt to ward off the blow.

他出于挡住这一击的无谓企图抬起了他的胳膊。

《柯林斯英汉双解大词典》

She fell off a ladder and broke her arm.

她从梯子上掉下来，摔断了胳膊。

《牛津词典》

One of them took hold of my arm. He shook me and lifted me off the ground.

VOA: special.2010.07.17

Suppose Darth Vader had ended a little higher and cut off Luke's entire arm.

假设达斯·维特最后太激动了,把卢克整只胳膊都砍掉了。

耶鲁公开课 - 死亡课程节选

Once again, he took off a metal band from his arm and gave it to me.

VOA: special.2010.07.31

On one side the logos of 60 exhibitors including Microsoft, Amazon, Nokia, HTC, Motorola Mobility, Cisco, and Asus with big booths showing off ARM-based products.

FORBES: ARM: Teeny-Tiny Booth, Big Impact

Then Ali would finish off his arm-weary opponent.

CNN: From Charles Bierbauer

In one grisly incident in April 2009, mortuary workers were ordered to saw off the arm bone of a deceased soldier in order to fit his body into a military uniform for burial, in accordance with the wishes of his family.

BBC: Dover Air Force Base 'lost US troop remains'