串接是指当不同样式表中对相同属性有不同定义时，应该要用哪一个样式表中的定义的规则。
Cascade refers to the rules to determine which property gets applied when a property is declared multiple times in the different style sheets.
若一个HTML文件中包含有多个样式表，那串接这个概念就非常重要了。
The concept of cascade becomes important when multiple stylesheet are specified for an HTML document.
若一个HTML文件中包含有多个样式表，那串接这个概念就非常重要了。
The concept of cascade becomes important when multiple stylesheet are specified for an HTML document.
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