这座城市拥有一个复杂的道路网络。

The city has a ___complex network of roads.

这部电影的情节太复杂了，我跟不上。

The movie's plot was so ___complex that I couldn't follow it.

我们花了两周时间才完成那个非常复杂的手术。

It took us two weeks to complete the very ___complex operation.