Coal mining is an ancient profession, and has been recognized as wildly risky since the very start.
煤矿开采是一种古老的职业，有史以来，就一直被认为是风险极高的职业。
Leather was one of the first manufactured materials, and the leather Technologist can claim to be a member of an ancient profession.
皮革是第一个制造材料，皮革技师也不能自称为一个成员，一个古老的行业。
Hydrogen sulfide leaks, methane explosions, mine-stope collapses, oh my! Coal mining is an ancient profession, and has been recognized as wildly risky since the very start.
硫化氢泄露、甲烷爆炸、煤矿坍塌，天呢，太危险了！煤矿开采是一种古老的职业，有史以来，就一直被认为是风险极高的职业。
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