Abstract-EN.tex

\xiaosi

英文摘要应与中文摘相对应，250个实词左右。采用第三人称介绍该学位论文内容，叙述的基本时态为一般现在时，确实需要强调过去的事情或者已经完成的行为才使用过去时、完成时等其他时态。
ABSTRACT为三号Times New Roman加粗居中。
英文摘要正文为小四号Times New Roman，固定1.5倍行距。英文关键词“KEY WORDS”大写，其后的关键词第一个字母大写，关键词之间用半角逗号隔开。
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