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。
There are several underground lines in Chengdu, and more are under construction.
成都现在有好几条地铁线路，还有更多正在修建中。
There are four underground lines in Beijing, and several lines are under construction.
北京有四条地铁线，还有几条线也正在建设之中。
It is in the construction of underground structures that bolting has had its greatest application.
介绍在地下结构的建筑闩上它才有最巨大的应用。
Underground tunnel support of soft expansion rock is a main difficulty in mine construction currently.
松软臌胀岩层的井下巷道支护是目前矿山建设中的一个主要难点。
There are four underground lines in Beijing, and several lines are under construction.
北京有四条地铁线，还有几条地铁线也正在建设中。
It is difficult to handle underground water in the process of subway construction.
在地铁建设过程中，如何处理好地下水是一大难题。
Shield tunnel is an attractive excavation method in the construction of municipal underground engineering.
盾构法隧道施工在城市地下工程建设中有着广泛的应用前景。
There are four underground lines in Beijing, and several lines are under construction.
北京有四路地下铁，还有一些线路正在修建中。
There are four underground lines in Beijing, and several lines are under construction.
北京有四路地下铁，还有一些线路正在修建中。
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