complex process

例句：

1. 1.The problem is so complex that it's hard to solve.
   这个问题太复杂了，很难解决。
2. 2.The software is designed for a complex user interface.
   这款软件是为复杂用户界面设计的。
3. 3. The company has a complex supply chain.
   这家公司有一个复杂的供应链。