这是气相中的分压。
一部分原因是因为那一段时间经济萧条，另一个原因就是可再生能源以及天然气的使用量增加。
That was partly due to the bad economy, and partly to the increased use of renewables and natural gas.
这分压等于气相中b的摩尔分数，乘以总压强。
It's the molar fraction of B in the gas phase times the total pressure.
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