... JMWNY Back shaft 后轴 back-up shaft 支持辊辊轴 Front and back shaft sleeve 前后轴套 ...
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Rescuers said they would resume drilling a separate shaft as a back-up plan in case of problems with the first one.
救援人员称,作为备用他们将会重新开钻另一口竖井,以防第一口竖井出现问题。
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