生产这种不饱和烃类最重要的路线是靠蒸汽裂解，主要以石油气体和石脑油作原料。
The most important route to produce these unsaturated hydrocarbons is by steam cracking, using principally petroleum gases or naphtha as feedstock.
如果温度一定，空气中的水蒸汽含量与不饱和状态下最大水蒸气含量就有相对关系。
The amount of water vapor in the air relative to how much water vapor the air can "hold" before saturation occurs at a given temperature.
如果温度一定，空气中的水蒸汽含量与不饱和状态下最大水蒸气含量就有相对关系。
The amount of water vapor in the air relative to how much water vapor the air can "hold" before saturation occurs at a given temperature.
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