For example, in all current systems, mapped regions must be page-aligned.
例如，在所有当代的系统中，所有被映射区域必须是页面对齐的。
Title texts can be aligned to the left, right, and center of the page based on user need.
标题文本可以根据用户需要与页面左对齐、右对齐和居中对齐。
By default, the page number is center aligned; if desired, you can leave it left or right aligned using the left or right element, respectively.
默认情况下，页码是居中对齐的；如果需要，您可以分别使用Left或Right元素使它向左或向右对齐。
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