When the robotic arm first reached that depth, it hit a hard layer of frozen soil.

当机器臂第一次达到这个沟的时候，它触到了一层硬的冻土。

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While meeting the requirement of the minimum depth of the overlaying soil and the frozen depth, the cross-reverse fault pipeline is appropriate to be buried in shallow soil.

跨逆断层的埋地管线在满足管顶最小覆土深度、土壤冰冻深度以及抗浮要求等前提下，以浅埋为宜。

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Frozen city line depth is 0.8 meters, for the sandy clay soil, the main road width of 40 metres, are laying asphalt.

城市的冰冻线深度为0.8米，土壤为砂质粘土，主要马路宽为40米，均由柏油铺设。

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