例句與造句

1. Nitrous oxide ( n2o ) , a naturally occurring greenhouse gas , was one of the trace gases of nitrogen cycle . its lifetime was about 120 years in the troposphere . it has caused considerable concern since n2o not only contributed to the destruction of stratospheric ozone , but also its greenhouse effect strength was about 200 times higher than carbon dioxide ( co2 )
   溫室效應氣體n _ 2o是氮素循環(huán)中的痕量氣體之一，其溫室效應強度是co _ 2的200倍左右，它在大氣中的停留時間長達120年，而且，其消耗或轉(zhuǎn)化是以破壞o _ 3為代價的。
2. It's difficult to find nitrous oxide (n2o) in a sentence. 用nitrous oxide (n2o)造句挺難的