tricky

Replacing the broken screen on this smartphone is a very tricky process.

(Chinese) 更换这款智能手机的破碎屏幕是一个非常棘手的过程。

The diplomat faced a tricky situation where he had to balance the interests of both nations.

(Chinese) 外交官面临着一个棘手的局面，他必须平衡两国的利益。