Always start a new line for each selector and declaration.

声明每个选择器时都用一个新行。

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The selector and declaration are positioned on the same line, as shown.

选择器和声明位于同一行上，如下所示。

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The selector and declaration are positioned on the same line, as shown.

选择器和声明位于同一行上，如下所示。

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