If you're not doing heavy up-front development or committing to years of maintenance on each feature, you can easily try out different things.
只要你没有进行大批量的前期开发，或是承诺在特性上维护多年，你就能随意尝试不同的东西。
If your website is content-heavy and is updated frequently (e.g. a blog or news site), having an RSS feed will be a necessary site feature for keeping your users up-to-date with fresh content.
——如果你的网页内容很多，而且更新非常快（比如：博客或者新闻网站），提供RSS订阅将保证你的读者能第一时间收到你更新的消息和内容。
Overriding allows programmers to replace a method's implementation with new code. Overriding is a handy feature, and most OO programmers make heavy use of it.
覆盖答应程序员用新代码替换一个方法的实现。覆盖是具有便利的特点，大多书面向对象程序员乐意使用它。
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