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1.The lens has no internal AF motor and relies on a slotted drive screw operated by the camera.
该镜头没有内部马达，需要依靠机身的对焦马达驱动。收藏指正
2.A jack operated by a screw.
螺旋起重机，螺旋千斤顶由螺旋杆运作的起重机收藏指正
3.Performance tests for 10000kN dutch operated screw press
10000kN离合器式螺旋压力机性能试验收藏指正
4.each of the four legs contains a simple screw jack with a thrust bearing that is operated telescopically inside of two tubes.
四条腿中每个都装有一个简单的螺旋千斤顶，千斤顶中又有一个在两根管道中做伸缩操作的推力轴承。收藏指正
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