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说明文是一种以说明为主要表达方式的文体。它是对客观事物的性状、特点、功能和用途等等做科学的说明的。写说明文,最基本的要求是能准确揭示事物的特征;所以在写作前要仔细观察,查阅资料并认真比较。写作时要按照一定顺序,语言要确切、简洁、通俗,使大多数人读了你的文章后,对你所介绍的事物有一定了解。在西安,不管你身在何处,都能欣赏到古城墙的风采。站在城墙下,昂首仰望,你会看到它宛如大地脊梁的身影;站到城墙上,俯视四野,更会体会到一股巨人的气概。西安古城墙,始建于隋朝,从唐代初期开始大规模完善。唐代晚期,因防
Description is a description of the main style of expression. It is a scientific description of the traits, characteristics, functions and uses of objective things. Writing descriptive texts, the most basic requirement is to accurately reveal the characteristics of things; so be careful before writing, access to information and serious comparison. Writing in accordance with a certain order, the language to be exact, concise, popular, so that most people read your article, you have introduced something to understand. In Xi’an, no matter where you are, you can admire the ancient city walls. Standing under the city wall, looking up, you will see it as the backbone of the earth; standing on the city walls, overlooking the four fields, but will also appreciate a giant spirit. Xi’an ancient city walls, was built in the Sui Dynasty, from the early Tang Dynasty began large-scale improvement. Late Tang Dynasty, because of prevention