RT，详细分析下~

[1] Difficulty较Problem困难的程度轻：
Difficulty n.困难. 难点-》比较难.但是可以解决

Problem n.问题. 难题-》比较难.有可能解决

He has some difficulties doing his homework. But don＇t worry. I think he can finish it by himself later.
他做家庭作业有点困难.可是不用担心.我想稍晚些他能自己做完功课.
He has some problems finishing this project now so he has to check his reference books.
要完成这个项目他现在有点困难.以至于他不得不翻阅他的参考书.

[2] Difficulty意思比较泛，困难，难点，可以是任何事情/任何方面。既可以表达problem 代表的待解决的问题，也可以是客观存在的困难，难处，困境。
Problem相对来说，是做某事过程中出现的问题，难题 ，需要解决的某个问题。

如：
He has hearing difficulty. 他有听力困难。
Do you have any difficulty with English?
你英语上有困难吗？
financial difficulty 财政困难, 资金困难
a key problem 一个关键问题
The problem was how to move the heavy machinery.
问题是怎样移动这台沉重的机器。