It is the most difficult to use simple words to express profound principles.

用大白话讲出深刻的道理是最难的。

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The final refactoring considered here is the most difficult to use: Change Method Signature.

本文介绍的最后一个重构方法也是最难以使用的方法：Change Method Signature（改变方法的签名）。

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However, part of the reason lies with the fact that most imperative languages have lackluster support for it, making it more difficult to use than it should be.

然而，造成这种现象的部分原因是大多数命令式语言没有提供相应的支持，因此使用递归很困难。

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This means the spring floods that cleared the river of vegetation no longer happen, making it difficult for the cranes to use the length of the river to roost out of range of most predators.

BBC: Nebraska��s awe-inspiring crane migration

After all, why buy a brand new expensive computer that's difficult to learn when you can get an easy-to-use tablet that can do most of the same stuff at a fraction of the price?

CNN: Is the PC dead?