记叙文往往一开头就提供有关背景环境的消息，清楚地交代文中所述的动作发生在何时、何地和与何人有关。
When, where and to whom the action in a narrative happened is often made clear at the beginning of the narrative.
镜头动静结合用以介绍环境背景、交代时间空间、抒发人物情绪、推进故事情节等等。
Lens for introducing environment combining static background, metasomatism time space, to express the characters' emotions, promoting storyline, etc.
第一章首先交代了模糊语言学的历史背景及其相关基本概念—模糊集合与模糊限制词。
The first chapter gives, above all, an account of the historical background of fuzzy linguistics and two basic concepts-fuzzy set and hedges with respect to it.
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