They have used this area to create their underground bases and caverns, from which they operate.
并且他们利用这个区域来创造他们秘密的基地和洞穴，他们从这地方运转。
The engineering geologic conditions in the selected area of constructing LPG underground storage caverns played a decisive role.
在LPG地下洞库的建设中，选区的工程地质条件起决定性作用。
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