BISAC levels of specificity complement Library of Congress Subject Headings, allowing patrons to drill down into a topic in an intuitive system of guided navigation.
BISAC的等级补充了国会图书馆的主题词，让读者能够在带有导航功能的系统中进入某一个具体的主题。
Three modes of a camera control, planned navigation, manual navigation, guided navigation, are implemented.
同时实现了虚拟相机控制的三种方式：计划漫游、手动漫游、引导漫游。
Three modes of a camera control, planned navigation, manual navigation, guided navigation, are implemented.
同时实现了虚拟相机控制的三种方式：计划漫游、手动漫游、引导漫游。
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