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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The retrofit plan of the seal at the shaft end of the petroleum gas compressor and its result were presented.

介绍了富气压缩机轴端密封的改造方案及其效果。

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And the selected dynamic part takes the direct driving plan with hollow hydraulic motor and has the advantages of light, cheap and small volume in the direction of shaft.

动力头采用中空式液马达直接驱动方案，具有重量轻、成本低、轴间尺寸小等优点。

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This drill will be used, engineers say, for the so-called plan B, as a parallel attempt to a drill a rescue shaft down to the miners.

CNN: New drill arrives in Chile with great fanfare

The Plan B would drill at an 85 degree angle into an area of mine shaft that is used as a mechanical workshop.

CNN: New drill arrives in Chile with great fanfare