HTML5规范中的新元素需要新的指导来显示它们 —因而需要新版CSS标准。
New elements in the HTML5 specification require new guidance to display them—hence the need for the new version of the CSS standard.
但需要一些规则来创建这些指导原则，并且需要相应的规则来强制实施它们。
But while it does require some level of discipline to create these guidelines, it definitely requires discipline to enforce them.
它们容易学习，你不需要一位指导员或任何工具来进行。
They are easy to learn, and you don't need an instructor or any special tools to do them.
你可以自己进行呼吸练习。它们容易学习，你不需要一位指导员或任何工具来进行。
You can do breathing exercises on your own. They are easy to learn, and you don't need an instructor or any special tools to do them.
你可以自己进行呼吸练习。它们容易学习，你不需要一位指导员或任何工具来进行。
You can do breathing exercises on your own. They are easy to learn, and you don't need an instructor or any special tools to do them.
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