其他两种气体可以显著减小对环境的影响：异氟烷体现在温室气体的作用上仅仅是地氟醚的三分之一，而七氟醚只有地氟醚的八分之一。
The other two gases have significantly less impact: isoflurane is only a third as powerful a greenhouse gas as is desflurane and sevoflurance has only an eighth of desflurane's effect.
井筒内的天然气都是由多种气体组成的混和天然气，由于气体各组分的分子量不同，会在重力场作用下发生重力分异，从而使井筒内混和气体的性质与单一气体有很大差异。
Natural gas in wellbore is a mixed gas consisting of various gas. Due to molecular weight of all kinds of gas is different, they will occur gravity segregation under the action of gravity field.
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