three safety principles
三大安全原则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Finally, three principles that should be abided by in preventing explosion contingency, they were elaborate design, elaborate construct, strengthening safety management.
强调了就预防爆破事故应遵守的精心设计、精心施工、加强安全管理这三条原则。
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