蓝色火苗意味着屁里含有甲烷。
A blue flame is indicative of the presence of methane in the flatus.
燃烧时无烟无味，有浅蓝色火苗，没有任何添加物，燃烧时间为普通原木树炭的3倍(3 - 4小时)。
When burning smokeless tasteless, has the light blue flame, does not have any supplement, the combustion time for ordinary original ebon coal 3 times (3-4 hour).
他们大部分时间都躲在帐篷里，蜷在赫敏擅长营造的那些明亮的蓝色火苗旁边取暖。这些火苗很有用，可以舀起来放在瓶子里随身携带。
They spent most of the day inside the tent, huddled for warmth around the useful bright blue flames that Hermione was so adept at producing, and which could be scooped up and carried around in a jar.
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