Mathematics some difficulty, I found that the wrong one.
数学有些难度，我发现错了一题。
We overcome some difficulty in mathematics and calculate the free energy and the entropy of black hole in high dimensions space-time.
我们克服了数学上的一些困难，在高维情形里计算了动态黑洞的自由能和熵。
Or you attend a mathematics class, and you have some trouble keeping up because the difficulty level is beyond you.
又或者，你去上数学课，由于难度级别超过了你的能力，让你觉得有些跟不上。
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