vary in the ability to tiller

例句：

1. 1. The farmer hired atiller to help with the planting.
   农民雇了一个犁手来帮忙种植。
2. 2. Thetiller was used to turn the soiland prepare the ground for planting.
   犁手用来翻土，为种植做准备。
3. 3. Thetiller was a crucial tool in theagricultural process.
   犁手是农业过程中一个至关重要的工具。