loop lifter

例句：

1. 1. The loop lift is used to lift heavy objects from the ground.
   环状提升机用于从地面提升重物。
2. 2. The loop lifter was designed to make lifting heavy objects easier.
   环状提升器的设计是为了使提升重物更加容易。
3. 3. The loop lifter was installed in the factory to improve efficiency.
   环状提升器被安装在工厂中以提高效率。