In recent years, accidents caused by explosives and powders occur so often that the assessment of explosives and powders becomes an important task of concerns and discussions.
而近几年，火炸药及其制品燃烧爆炸危险源重大特大事故频发，火炸药危险源安全评价一直是人们关心和讨论的课题。
In recent years, accidents caused by explosives and powders occur so often that the assessment of explosives and powders becomes an important task of concerns and discussions.
而近几年，火炸药及其制品燃烧爆炸危险源重大特大事故频发，火炸药危险源安全评价一直是人们关心和讨论的课题。
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