boardless plow

例句：

1. 1.The farmer used a boardless plow to clear the field.
   农民使用无犁犁来清理田地。
2. 2. The new tractor has a boardless plow, which makes it easier to handle heavy soil.
   这台新拖拉机有一个无犁犁，这使得它更容易处理重土。
3. 3. The farmer had to use a boardless plow to remove the snow from the fields.
   农民不得不使用无犁犁来从田地中清除积雪。