井下 underground
- 约瑟夫被放到井下的意义是什么?
What is the meaning of Joseph being put in the well? - 适用煤矿井下各种需要监控的场所。
Need to monitor the application of various mine sites. - 井下视像消耗性材料费用很低。
I hope you can give us the detail information about it.
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