火源是指能够使可燃物和助燃物（包括某些爆炸性物质）发生燃烧或爆炸的能量来源。这种能量来源常见的是热能，还有电能、机械能、化学能、光能等。
In the meantime, the concentration of the combustible gas and the number and distributive location of fire source have influence on the gas explosion propagation seriously.
同时指出参与爆炸的瓦斯量、瓦斯气体浓度和火源个数及分布位置对瓦斯爆炸传播有重大影响。
参考来源 - 矿井瓦斯爆炸冲击波传播规律及影响因素的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
你最好警告你的孩子独自在家时要远离火源。
You'd better warn your children to keep clear of fires when they are at home alone.
森林大火往往产生大量的浓烟，大火很难控制是因为很难找到火源。
Wildfires that produce a lot of smoke are difficult to manage because the source of fire can be hard to see.
爱是人们心里的一个火源，它是无尽期、无止境的，任何东西所不能局限，任何东西所不能熄灭的。
It is a point of fire that exists within us, which is immortal and infinite, which nothing can confine, and which nothing can extinguish.
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