A coolie is basically a coolie. For example, water, electricity, tile, wood and oil on the construction site are all technical jobs. If you can't do it, you can only help with these tasks, such as transporting materials, removing dust, moving bricks and so on. There are also jobs with little technical content attached to the construction site, such as the uncle who guards the door, the aunt who cleans the toilet, the aunt who helps the kitchen, and the uncle who sweeps the main road. There is also a top job without skills and management.