intricate
adjective uk/ˈɪn.trɪ.kət/ us/ˈɪn.trə.kət/
错综复杂的；复杂精细的；难理解的；难解决的
having a lot of small parts or details that are arranged in a complicated way and are therefore sometimes difficult to understand, solve, or produce
The watch mechanism is extremely intricate and very difficult to repair. 手表的机械结构非常复杂精细，很难修理。
Police officers uncovered an intricate web of deceit. 警官们揭开了一整套错综复杂的骗局。