n.

1. 困境，进退两难[C]
   Mary is facing the dilemma of obeying her father or marrying the man she loves.

   是服从父亲还是嫁给自己所爱的人是玛丽面临着的难题。

2. 【逻】两难推理，两刀论法

n.

1. a situation in which a difficult choice has to be made between two or more alternatives.
   ▸informal a difficult situation or problem.
2. Logic  an argument forcing an opponent to choose either of two unfavourable alternatives.