却非常不易掌握
But it is extremely difficult to master
以上为机器翻译结果，长、整句建议使用 人工翻译 。
虽然此命令的功能非常强大，可以解决许多问题，可是对许多人来说，尤其是初学者来说，却非常不易掌握。
Although this order is very powerful, can solve many problems, but for many people, especially beginners, very hard to grasp.
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