那些鸟类模型做起来相当棘手，不是吗？

Those bird models are quite ___tricky to make, aren't they?

这是一个没有简单答案的棘手决定。

It was a ___tricky decision with no easy answers.

没有地图在城市里找路可能会很棘手。

Navigating the city without a map can be ___tricky.