螺旋千斤顶:screw jack
例句:
The lifting capacity of this screw jack hoist is 5 ton. 
这个螺旋千斤顶的起重能力为5吨.
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。
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