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。