Warning: file_put_contents(/www/wwwroot/ppbbu/28094.com/cache/ff5b16a2b2c1cd589339972439e7493d.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/28094.com/index.php on line 55 jack-screw例句_jack-screw英汉例句_jack-screw双解例句_贰靶汉英词典
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。