劳工

例句：

1. 1. The workers are putting in long hours at the construction site.
   工人们正在工地上辛勤工作。
2. 2. The farmer has been working hard all morning to prepare for the harvest.
   农民一直努力工作到上午，为收割做准备。
3. 3. The company is investing heavily in research and development to improve its labor efficiency.
   公司正大力投资于研发，以提高劳动效率。