用来与顶部挂片连接的是一根扁带，一把带锁的主锁，一个petzl胶套(keeper)。

A sling, locking carabiner, and petzl string (keeper) were used for the point of attachment to the top anchors.

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你可以租条安全带，主锁和安全器，不过长期租用的话，花的钱已经够买自己的了。

You can rent a harness, carabiner and belaying device in most of the gyms but in the long run it pays off to buy your own.

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一种电气开关锁扣机构（1），具有一个主锁扣机构（2），该主锁扣机构 包括一个驱动轴（3）和一个耦合在驱动轴上的传动输出装置（4）；

The present invention discloses a switching mechanism (1), which has a main arresting mechanism (2) including a drive shaft (3) and a transmission output device (4) that coupled on the drive shaft;

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