jackrod

例句：

1. 1.The jackrod was used to lift heavy objects.
   长杆被用来举起重物。
2. 2.The worker used the jackrod to adjust the door.
   工人使用长杆来调整门。
3. 3.The jackrod was essential for the construction work.
   长杆对于建筑工作来说是必需的。