1640s, "tangled," from past participle adjective from complicate. Figurative meaning "not easy to solve, intricate, confused, difficult to unravel" is from 1650s.
权威例句
1. Though off-puttingly complicated in detail, local taxes are in essence simple.
虽然地税在细节上复杂得要命,但在本质上却很简单。
2. His love life was complicated, and involved intense relationships.
他的爱情生活很复杂,几段感情都是轰轰烈烈。
3. The situation was complicated by the spread of a serious forest fire.
一场严重的森林大火的蔓延使得形势更加复杂。
4. He described it as an extraordinarily tangled and complicated tale.
他说那是一个非常曲折复杂的故事。
5. The text is approachable, coping well with quite complicated subjects.