Water heater can't fire solution: check the ac power plug lights are bright, to rule out power supply part of the question.
热水器打不着火的解决方法：检查交流电源插头指示灯是否亮，先排除电源供电部分的疑问。
After the spark plug ignition, the water molecule can generate much oxygen in the high temperature and high pressure to supply the fuel combustion.
在火花塞点火后，水分子在高温高压下产生大量的氧气，供油分子充分燃烧。
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