Designated by a colon preceding the name, pseudo-classes are independent of particular elements and instead look at what's happening within the document.
伪类的表示方法是在名称前面加一个冒号。伪类与特定元素无关，而是根据文档中发生的情况应用样式。
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。
Pseudo-elements are similar to pseudo-classes (and share syntax with them) but define content within the document. Pseudo-elements defined by the CSS2 Recommendation include
伪元素与伪类相似（语法也相同），但它定义的是文档中的内容。
Other, less-widely supported pseudo-classes include: first-child, : link, : visited, : active, and: focus and: lang. Note that a pseudo-class can be applied to a specific element type, like this.
还没有得到广泛支持的其他伪类包括：first - child、：link、：visited、：active、：focus和：lang。
In this paper, the existences of almost periodic solutions and pseudo almost periodic solutions for several classes of functional differential equations are investigated.
本文研究了两类具体含逐段常变量微分方程的伪概周期解的存在性问题和一类一阶微分方程组的数值解。
In this paper, the existences of almost periodic solutions and pseudo almost periodic solutions for several classes of functional differential equations are investigated.
本文研究了两类具体含逐段常变量微分方程的伪概周期解的存在性问题和一类一阶微分方程组的数值解。
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