"手臂" 的英文是 "arm"。这个词来源于古英语 "ærm"。
例句：
He broke his arm in the accident. (他在事故中手臂骨折了。)
She has a tattoo on her left arm. (她左手臂上有一个纹身。)
He rolled up his sleeves to do the dishes. (他卷起袖子洗盘子。)
The robot's arm can move in multiple directions. (机器人的手臂能够沿着多个方向移动。)