Modeling the real world in software means that you need a tool flexible enough to handle all of the edge cases.

使用软件建模真实世界意味着需要有足够灵活的工具来处理所有极端情况。

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You need a tool that tells you which parts of a program are not being tested so you can write tests for those parts and find more bugs.

您需要有一个工具告诉您程序的哪些部分没有测试到，这样就可以针对这些部分编写测试代码并找出更多bug。

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You need a tool?

你要工具？

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The standard library, that first line of code, it's not strictly necessary but any time you use a function, a tool that someone else wrote that lives in that so called library, you do need that include line as we'll see.

标准库函数--第一行代码，严格来说，不是每次都要写的，但是一旦你调用某个别人写，的函数，而这个函数又恰巧位于标准库里面,你就要像我们看到的这样，把它include进去。

哈佛公开课 - 计算机科学课程节选

In that case, you need a different tool.

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If your email provider is approaching their application as a commoditized tool without any differentiation, then maybe you need to turn to a provider who understands that email is the core of business communications with the ability to significantly enhance productivity.

FORBES: Email: Not Just a Commodity

For that reason you may decide that a tablet, and especially the iPad or even the new Nexus 7 tablet (if you have a WiFi connection), is a far better choice as a communications tool when you are overseas if you do not need the convenience of a smaller device with its obvious limitations as far as screen size.

FORBES: Is The iPad Better Than A Cell Phone For Global Roaming?