主要交代本文的选题缘由、研究范围和研究方法、语料来源和标注格式，对以往的研究成果进行概括和总结。

Reasons to choose the topic, research scope and methods, the data sources and label format are introduced. A brief summarization is given to the previous research achievements.

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最后同时选中两个三角形和下面的苹果进行复制或剪切，再右击原来的苹果标注框选择“设置形状格式”。

Finally selected two triangles and at the same time the following apple replicate or shear, right-click on the original apple again annotation boxes to select "set format" shape.

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关于标准引用格式，请参考北科罗拉多大学图书馆（UNC Libraries）的文献引用标注指南。

For guidance on formatting citations, please see the UNC Libraries citation tutorial.

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