gas void fraction的用法和样例：
例句
- However, due to the low temperature in winter, the rate of gas production in the marsh gas tank becomes lower, even the marsh gas tanks are frosted.
但我国北方冬季气温低，导致沼气池产气率低，甚至出现冻裂池体等现象。 - Distribution of reaction zones affects the heating value of producer gas and the rate of gas generation, as well as tar content and particulates.
气化炉内之反应区分布状况不但会对产气热值与产气率产生影响，同时也会影响焦油与粒子之生成量。
