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1·Yesterday we decided that we should go to machine shop to repair the kelly spinner the day after tomorrow.

昨天我们决定后天去机厂修理方钻杆旋扣器。

2·The kelly spinner has largely replaced the infamous spinning chains, which were responsible for numerous injuries on the rig floor.

方钻杆旋转器已经很大程度地替代了旋链，而正是旋链造成了钻台上的大部分伤害事故。