plough the sand

例句：

1. 1. The farmer ploughed the fields every morning.
   农民每天早上都耕地。
2. 2.The plowing of the field was completed by the end of the day.
   田地的耕作在当天结束时完成。
3. 3.The ploughing of the field has been completed.
   田地的耕作已经完成。