breath/ brεθ /

1.noun [c/u] 
(intake of air) 呼吸

2.noun [u] 
(air from mouth) 口气

out of breath
上气不接下气
under one's breath
低声说
bad breath
口臭
to get one's breath back
 [BRIT] 恢复正常呼吸
to go out for a breath of (fresh) air
出去呼吸(新鲜)空气
a breath of fresh air
 [fig] 新意
there wasn't a breath of wind
一丝风都没有
to catch one's breath
喘口气
to hold one's breath
屏住呼吸
don't hold your breath!
 [fig] [inf] 别太指望了!
to be short of breath
呼吸短促
to take a deep breath
深呼一口气
it takes your breath away
使人心醉神迷