bolster screw jack

例句：

1. 1.He used a bolster screw jack to lift the heavy box off the floor.
   他用一个支撑式千斤顶把沉重的箱子从地板上抬起来。
2. 2. The engineer used a bolster screw jack to support the roof during construction.
   工程师用一个支撑式千斤顶在建造期间支撑屋顶。
3. 3.The workers used a bolster screw jack to lift the heavy equipment onto the truck.
   工人们用一个支撑式千斤顶把重型设备抬上卡车。