Lastly, test results can be difficult to understand.

最后，测试结果可能很难理解。

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Now, even though it may be difficult to understand how a huge mass of ice can move—or flow, it's another word for it—it's really no secret that glaciers flow because of gravity.

如今，即使想要知道一大块冰如何移动——或换个词讲，漂浮——是非常困难的，但众所周知冰川漂浮是由于重力。

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Should poetry be difficult to understand?

诗词本来就该是难以理解的吗？

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But scientific information can be difficult to understand and even more difficult to explain to others.

UNESCO: Science Communication

The path of the mortgage rate might be difficult to understand, so we will explain with an example.

FORBES: Introduction To Asset-Backed And Mortgage-Backed Securities

It would be difficult to understand what monitoring role Lagarde and company would be playing when the issue of Italy or Spain resurfaces.

FORBES: Eurogroup Meets, Could Kick Greek Can Into 2015