There must be a purpose in telling a story. The writing may want to prove a theory, to illustrate a concept, to praise a virtue, to condemn a vice, etc.
讲故事必定有其目的：或证明某一理论，或阐明某一概念，或赞美某种美德，或谴责某种罪恶等等。
Purpose and Methods: In this study, the micronucleus test and comet assay of Vice faber were used to screen pollution situation of the surface water of Yangzhong city.
目的与方法：本文应用蚕豆根尖微核技术和彗星试验对扬中市不同水体的遗传毒物污染状况进行了初步调查。
Purpose and Methods: In this study, the micronucleus test and comet assay of Vice faber were used to screen pollution situation of the surface water of Yangzhong city.
目的与方法：本文应用蚕豆根尖微核技术和彗星试验对扬中市不同水体的遗传毒物污染状况进行了初步调查。
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