1. Cleaner: Cleaner is a kind of disrespectful job. They often need to deal with dirty places, such as toilets, trash cans, sewage drainage systems and so on. Few people will thank them for their work.

2. Repairmen: Repairmen need to bear a lot of work pressure, because the problems they face may be very complicated. Moreover, some customers may be very demanding and picky, which will make the maintenance workers feel stressed and tired.

3. garbage disposal workers: garbage disposal workers need to spend a lot of time dealing with garbage, sometimes it will be disgusting and harmful. Not only that, they also need to endure the bad smell and environment.

4. Railway workers: Railway workers need to work on the railway every day, facing problems such as wind and sun, cold weather and noise pollution. Moreover, because they need to maintain the normal operation of the railway, this job is also a great burden on their health.

5. Fishermen: Fishermen need to work at sea and bear great risks and pressures. They often need to go fishing in bad weather, and long-term work and sea environment will cause great burden to their health.