serious workers only
仅限严肃工作人员
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At first, workers reported only minor damage underground but later more serious problems developed and cracks caused by the tremor caused methane gas to flood into the area.
BBC: Earthquake sparks methane alert
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模块上移
模块下移
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