universal selector

基本解释

If the universal selector is not the only component of a simple selector, the "*" may be omitted. For example
如果全局选择符不是一个简单选择符的唯一内容，"*"可以省略。
blog.sina.com.cn
A simple selector is either a type selector or universal selector followed immediately by zero or more attribute selectors, ID selectors, or pseudo-classes, in any order.
一个简单选择符或者是一个类型选择符，或者是一个全局选择符，紧跟在后的是零个或多个属性选择符，ID选择符或伪类，次序任意。
blog.sina.com.cn
And, "A simple selector is either a type selector or universal selector followed immediately by zero or more attribute selectors, ID selectors, or pseudo-classes, in any order."
一个简单的选择器可以是一种类型选择器或是通用选择器跟随零或者更多属性选择器，ID选择器或者伪类，在任何顺序。
blog.sina.com.cn