I touched him lightly on the arm.

我轻轻碰了碰他的手臂。

《牛津词典》

She touched him gently on the arm.

她轻轻地碰了碰他的胳膊。

《牛津词典》

He gave her a playful punch on the arm.

他开玩笑地捶了一下她的胳膊。

《牛津词典》

The kind of dress that you dream of wearing when you're on the arm of a gorgeous man.

VOA: special.2009.03.27

And then deliver those computer signals either to guide the computer cursor on the screen or onto robotic arm to move the arm or perhaps even muscle stimulators to re-animate the paralyzed arm.

然后传递这些计算机信号,操控电脑屏上的光标,或者机器人手臂来活动手臂,或者甚至可能肌肉刺激器来让瘫痪的手臂重新动起来。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

The other problem is that as it was passed from me to another individual, to another individual, then the vaccine could change in some ways that were hard to predict because what accumulates in the lesion in my arm is different in some way than what accumulates in the lesion on a cow.

另外一个问题是当疫苗从我这传到另一人,到另一个个体,疫苗可能会发生某些改变,这种改变很难预测,因为胳膊上积累的病变,与牛身上积累的病变是不太一样的

耶鲁公开课 - 生物医学工程探索课程节选

Erdogan patted the moderator on the arm until he was granted one more minute to respond.

CNN: Turkish PM cheered after Davos walkout

After a while, my brother put his hand on the arm of the driver.

NPR: 'A Tale of Music': From 'Literature from the Axis of Evil'

After nicking Mr Mubarak on the arm, the 40-year-old assailant was shot dead by bodyguards.

ECONOMIST: Egypt��s waiting game