作者使用图形辅助来说明和扩展文本中的概念，因为图形是描述关系和阐明联系的另一种方式。

Authors use graphic aids to illustrate and expand on concepts taken up in the text because graphics are yet another way of portraying relationships and clarifying connections.

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在如今的博物馆里可以找到十六世纪教师使用的许多经典文本的副本，包括描述基于文本的口语课程的旁注。

Copies of many of the classical texts used by sixteenth-century teachers, including marginal notes describing the oral lessons that were based on the texts, can be found in museums today.

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本节描述一种简单的通过使用索引扩展创建反向文本索引的机制。

This section describes a simple mechanism for creating an inverted text index by using index extensions.

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