他讲笑话时，她开玩笑地拍了一下他的胳膊。

She gave his arm a playful ___slap as he told the joke.

打一下手是阻止孩子触摸危险物品的旧式方法。

A sharp ___slap on the hand was the old-fashioned way to stop a child from touching something dangerous.

在激烈的争吵中，他强烈地想扇她一巴掌，但他克制住了自己。

In the heat of the argument, he felt a strong urge to deliver a ___slap across her face, but he restrained himself.