In the 21st century the nature of work has predominantly moved from being manual labour and manufacturing to service economy based upon technological innovation.
在21世纪，工作的性质已主要从体力劳动和制造业转移到以技术创新为基础的服务经济。
2
For example, if you are designing a manufacturing process, you may be interested in modeling materials consumption or manual activities such as product packaging.