problem和difficult的区别

problem和difficult的区别 hard 和 difficult的区别 hard 和difficult的区别 problem和trouble的区别 problem和question的区别 find it difficult和find it is difficult的区别 deal with the problem和solve the problem的区别 settle the problem 和solve the problem 的区别 trouble和difficult的用法区别. 请问difficult和hard的区别谢谢 difficult 和 hard 的区别到底是什么? big trouble和 big problem的区别