There may still be some ignition or explosive powder left in them.
因为可能放过之后还是会有一些能够点燃或会爆炸的粉末存在。
To prevent the explosive event of boilers, coal powder must be completely burnt.
为了避免锅炉爆炸事件的发生，炉内煤粉必须充分燃烧。
To prevent the explosive event of boilers, coal powder must be completely burnt.
为了避免锅炉爆炸事件的发生，炉内煤粉必须充分燃烧。
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