For convenience, let us discuss it under twelve sub-headings.

为了叙述的方便，分为十二个小题目。

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Therefore use single lines of text for your headings and sub headings.

因此，标题和副标题最好只有一行文字。

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Therefore use single lines of text for your headings and sub headings.

因此，标题和副标题最好只有一行文字。

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