Simultaneously, some rather instable rock masses were formed in some parts of the upstream and downstream side-walls of the main machine hall.
同时，在厂房上下游边墙的局部地段形成比较严重的不稳定岩体。
Simultaneously, some rather instable rock masses were formed in some parts of the upstream and downstream side-walls of the main machine hall.
同时，在厂房上下游边墙的局部地段形成比较严重的不稳定岩体。
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