基本解释螺旋千斤顶同根派生 英汉例句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。