tractor cram-shell bucket

例句：

1. 1. The tractor is used to pull heavy loads on farms.
   拖拉机被用来在农场上拖拉重物。
2. 2. The farmer needs a tractor to help with the harvest.
   农民需要拖拉机来帮助收割。
3. 3. The tractor has a powerful engine that can move large amounts of soil.
   拖拉机有一个强大的发动机，可以移动大量的土壤。