This is a very difficult way to learn.
这是一种很困难的学习方法。
We know it is difficult to learn English. My English is very good. I learn English like this.
我们知道英语学起来很困难。我的英语不错，我是这样学英语的。
This is a very simple concept to understand and a very difficult discipline to learn.
这是个很容易理解并学会的概念。
This is a very simple concept to understand and a very difficult discipline to learn.
这是个很容易理解并学会的概念。
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