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第三、引言段和结尾段的重要性
在流程图的引言段和结尾段写作中可以适当进行过程的阶段划分和总结，使文章的构思上一个层次，摆脱“流水账”的俗套。
This diagram illustratesthe recycling process of glass bottles. The whole process is a cycle which can be divided into three main stages.
In summary, plants, humans and animals provide services for each other. Humans and animals need the oxygen that plants produce in order to stay alive. When humans and animals breathe out, they provide the carbon dioxide that plants need in order to survive.
