Pneumatic drifter is a new short distance and small bore underground construction machine.
气动穿孔机是一种新型短距离、小直径地下施工机械。
In underground construction, we often use artificially ground freezing method to control soft earth recently.
在地下工程施工中，为强化软弱地层，近年来常采用冻结施工法。
In underground construction, we often use artificially ground freezing method to control soft earth recently.
在地下工程施工中，为强化软弱地层，近年来常采用冻结施工法。
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