Attempts to identify New Guinean's hunter-gatherers face the well-known difficulty of defining what constitutes a hunter-gather group.
试图确定新几内亚的狩猎者和采集者面临着一个众所周知的难题：界定什么是狩猎者-采集者群体。
The book is divided into these three topics, as well defining exposure, special techniques, and a discussion of film vs. digital.
整本书分为三大主题：曝光的定义，特殊技巧，及胶片相机和数码相机的讨论。
Custom Categories can be used for classifying your content as well as defining navigation structures for the published Website.
用户自定义类可以被用来对你的内容分类和为发布网页定义操控结构。
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