It would be fun to challenge something highly difficult.
找高难度挑战，这会比较有趣。
This is difficult to estimate especially for a highly dynamic system.
这是很难估计的，尤其是对于高度动态系统更是如此。
Dogs are highly social animals and some have a difficult time being left alone.
狗是高度社会化的动物，当被独自留下时一些狗会出现问题。
But the observations are difficult to make and highly debated.
但是这些评论很难确定并且争议性都很大。
The cancer is highly malignant and very difficult to treat.
此型癌以恶性程度高为特点，治疗很困难。
It is very difficult to give a good numerical method for highly-oscillatory ordinary differential equations.
对高振荡微分方程给出一种好的数值解法是一件非常困难的事情。
It is very difficult to give a good numerical method for highly-oscillatory ordinary differential equations.
对高振荡微分方程给出一种好的数值解法是一件非常困难的事情。
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