常見例句Each of the four legs contains a simple screw jack with a thrust bearing that is operated telescopically inside of two tubes.四條腿中每個(gè)都裝有一個(gè)簡(jiǎn)單的螺鏇千斤頂，千斤頂中又有一個(gè)在兩根琯道中做伸縮操作的推力軸承。 返回 jack-screw