短語詞組短語methane gas emission 甲烷含量methane e emission 沼氣泄出Methane emission flux 甲烷排放通量abnormal methane emission 瓦斯異常湧出flux of methane emission 甲烷排放methane emission regularity 瓦斯湧出槼律methane emission volume 瓦斯湧出量methane emission from rice 稻田甲烷排放methane emission rate 甲烷排放通量 返回 methane emission