重大恶性事故
Major malignant accident
以上为机器翻译结果，长、整句建议使用 人工翻译 。
近年来煤矿接连不断地发生重大恶性事故，伤亡严重，影响极大，煤炭安全形势异常严峻。
In recent years, many significant pernicious accidents happened continuously and had serious casualties and odious effects, the coal security situation is stern.
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