breath：n.呼吸的空气;一次吸入的空气;微量;迹象，复数： breaths

breathe：v.呼吸;呼出;低声说

例句：

She took a deep breath to calm her racing pulse.

她深深地吸了口气，想使急速跳动的脉搏平静下来。

He took a deep breath, desperately trying to keep calm.

他深深地吸了口气，竭尽全力保持镇定。

Save your breath ─ you'll never persuade her.

不用白费口舌了——你永远说服不了她。

He recited the whole poem in one breath.

他一口气背出了整篇诗。

Have I got bad breath?

我有口臭吗？