循环气的英文：
recycle gas

recycle是什么意思：
v. （使）重复利用

This material is recyclable and will not pollute the environment.
这种材料是可循环利用的，因而不会污染环境。

secondary recycle isobutane
再循环异丁烷

recycled rubber median strip
再生橡胶高级公路中间分界之安全岛

The rubbish is then carted away for recycling.
垃圾被装上车送去循环利用。

Recycled paper: Paper made from pulps that consist mainly recycled fibres.
再造纸:用含有大量再造纤维的纸浆制成的纸。

gas是什么意思：
n. 气体；煤气；毒气；汽油
v. 放出气体；加汽油；用毒气杀伤（人）

development of gas
放出气体；放出毒气

This gas mask can immunize you against poison gas.
防毒面具能使你免遭毒气袭击。

long-distance gas
远程供应的煤气[天然气]

gas evolution analysis
气体放出分析

gas | boast | bragging
吹牛[吹大炮