过气的英文：
obsolescent
become obsolete
dying out
go out of use
outdated
go out of style
on the wane
ex-
参考例句：
an ex-soldier
过气军人
“A diamond is forever”. Always in fashion, never go out of style, year in and year out.
钻石是永恒的，永远时髦，永不过气，年年如此。
A breathless flight
令人喘不过气的飞行
At first, I used to run out of breath quickly, but now I can just keep on swimming.
起初我会很快喘不过气，但现在就可以一直游下去。
become是什么意思：
v. 成为；变得；适合；相称
To become blunt.
变钝，变迟钝
To become inflated.
膨胀变得充了气的。
To become firm or gelatinous; congeal.
凝固凝结或变硬；冻结
obsolete是什么意思：
adj. 废弃的；老式的
n. 废词
v. 淘汰；废弃
Antiquated;ancient;long obsolete.
过时的；古老的；久已作废的
This phrase tends to become obsolete.
这个短语已渐渐成为废词。
