Everyone knows that if you try to access a page that doesn't exist, the server will throw you back 404 page not Found, or if you mess up your rails code, you will get a 500 Application Error.
每个人都知道如果打开一个并不存在的页面，服务器会返回一个404错误页面。如果你的Rails程序出错了，会返回一个500应用程序内部错误的页面。
You'll make nicer code and fewer mistakes, and even if do you mess something up, you'll be closer to a working state that you can go back to.
这样会得到更好的代码，减少错误，即使真的有东西弄乱了，你也更容易让其步入正轨。
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