A CSS rule consists of a selector and a declaration block.
CSS规则由一个选择符和一个声明块组成。
The declaration block is surrounded by curly braces and made up of declarations.
声明块放在大括号中，由声明组成。
When a user agent can't parse the selector, it must ignore the declaration block as well.
当一个用户代理不能解析某个选择器的时候，它必须忽略整个声明块。
The right side of the rule contains the declaration block, which is made up of one or more declarations.
声明部分在规则的右边，它是由一个或多个声明构成的。
The right side of the rule contains the declaration block, which is made up of one or more declarations.
声明部分在规则的右边，它是由一个或多个声明构成的。
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