工作时间

例句：

1. 1. She has been working hard to improve her English skills.
   她一直在努力学习提高英语技能。
2. 2. The company is facing a difficult time due to the economic downturn.
   由于经济衰退，公司正面临困难时期。
3. 3. He works as a doctor in a hospital every day.
   他每天在医院里当医生。