• 1. safe mining depth: 安全开采深度
• 2. safe-mining depth: 安全开采深度
• 3. Minimum safe mining depth: 最小安全开采深度

更多释义

• 1.With the increase of mining depth, the possibility for rock burst increases correspondently. It has become a major factor which endangers the safe operation of coal mines.
  随着煤矿开采深度的增加，冲击地压危险越来越大，已成为严重威胁矿井安全生产的主要灾害。
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• 2.Along with the mining depth increasing, the frequency and intensity of the mine earthquake are increasing in the mine, which brings the huge stress to safe production.
  随着开采深度的增加，现有矿震的矿井发生矿震的频率和强度都在不断增加，给安全生产带来巨大压力。
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