简单的形状可以为一张照片加入次序和层次感。

Simple shapes can create order and sense within an image.

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尽管不要求按照特定的次序，但是坚持这个次序有好处，可以保持代码简单。

While there is no specific sequence required it has some advantages to stick to this rundown to keep the code simple.

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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。

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.

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