It is difficult to master even one of the martial arts.
精通哪怕仅是兵法之一都是困难的。
It is very difficult to master a foreign language.
精通一门外语非常困难。
Fortunately, it is not a very difficult skill to master.
所幸的是，这不是一个很困难的技巧掌握。
But for some other people, drawing is really a big headache, and they'll find it really difficult to master this skill.
但对于其他人来说，画画真是一个令人头痛的问题，他们会发现很难掌握这项技能。
But how to master it quickly in a short time, but it is a difficult problem.
但如何在短时间内迅速掌握它，却是一个比较难的问题。
But how to master it quickly in a short time, but it is a difficult problem.
但如何在短时间内迅速掌握它，却是一个比较难的问题。
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