棘手

例句：

1. 1. The problem withthe project is that it's tootricky for me to solve.
   这个项目的问题是对我来说太难了，我无法解决。
2. 2. Hefound the solution to the puzzle so trickythat he couldn't believe his eyes.
   他找到了这个谜题的解决方案，太复杂了以至于他不敢相信自己的眼睛。
3. 3. Thenew policy is so tricky that even expertsare struggling to understand it.
   这项新政策太复杂了，即使是专家也难以理解。