loading jack

例句：

1. 1.The loading jack was used to lift heavy boxes onto the truck.
   装载机被用来把沉重的箱子放到卡车上。
2. 2. The crane operator carefully lifted the heavy steel beam from the ground.
   起重机操作员小心翼翼地从地上抬起了沉重的钢梁。
3. 3. The loading jack is essential for moving heavy loads quickly and safely.
   装载机对于快速安全地搬运重物至关重要。