double ended retractors

例句：

1. 1. The double ended retractors areused to adjust the height of the table.
   双头拉出器用于调整桌子的高度。
2. 2.The double ended retractors were designedto be easy to use and maintain.
   双头拉出器设计得易于使用和维护。
3. 3.The double ended retractors are commonlyused in industrial settings to lift heavy objects.
   双头拉出器在工业环境中常被用来举起重物。