knotty

The new management faces some knotty problems.

新的管理层面临着一些棘手的问题。

Likewise, if one cannot deal with the things in hand, he or she must fail in the following knotty problems.

同样，如果一个人不能处理手头的事情，他或她一定会在以下棘手的问题上失败。

Einstein would furiously play his violin as a way to think through a knotty physics problem.

爱因斯坦会以疯狂地拉小提琴的方式来思考一个复杂的物理问题。

We cannot use knotty wood to make furniture.

不能用多节疤的木头制作家具。