位于重型井架或桅架式井架顶部的固定的滑轮组（称之为滑车轮槽轮），通过该滑轮组钻井钢丝绳进行穿绳。

The fixed set of pulleys (called sheaves) located at the top of the derrick or mast, over which the drilling line is threaded.

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报道解释了如何通过穿恰当的鞋，运动前伸展股四头肌和腘绳肌，运动时更加谨慎小心，更安全的减少膝关节损伤的风险。

The report explains how to safely reduce the risk of knee injuries by wearing the right shoes, stretching the quads and hamstrings before exercise, and being mindful during exercise.

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操作者应该穿防护衣和携带呼吸器，戴安全帽，穿工作鞋，携带安全绳。

Operators should wear protective clothing a breathing apparatus, a helmet, working boots, lifeline.

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