Equivalently, it means how much the first (left or top) margin will grow.

同样，这意味着第一个边距（左边距或上边距）将增长多少。

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Head margin: the margin at the top of a page.

头白边：书页上边的空白部份。

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Head margin: the margin at the top of a page.

头白边：书页上边的空白部份。

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