我是用他来编译LESS为CSS的，LESS 允许变数(variables)，混合(mixins)，函数(functions) 、嵌套规则(Nested rules)、运算(Operations)和许多其他的技术，让你的CSS更具维护性，主题性，增加性
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nested-rules 嵌套规则
Although those nested initialization items obey the details of the specified DTD validity rules, they are rather cumbersome.
尽管那些嵌套的初始化项遵从指定的DTD有效性规则的详细信息，但它们还是有点麻烦。
As you have seen, rules are often nested in nature. Fragments of rules may be highly reused.
规则常常是嵌套的，常常需要重用一些规则的片段。
How to use Object Names to coordinate nested fields when evaluating WebSphere TX map Rules. The map rule that contains the functional map call is shown below?
在计算映射规则时如何使用对象名协同嵌套的字段一节将描述这种行为。
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