它们是词义接近，但是程度不同。
相对来说，从difficulty，到 problem，再到 trouble 是愈来愈严重。
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
Trouble n.故障, 问题
大问题，故障，不一定能解决. 往往需要”倒退几步”,先纠正以前的问题，再往下做。
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。
He has some troubles finishing this project because the foundation was not set up correctly.
要完成这个项目他现在有大问题了，因为那地基打错了。
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