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。

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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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Please fill in the vice ticket seriously, for the purpose of accepting the award.

入场券副券信息请认真填写，以免影响兑奖。

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"The one thing that bugs me most about this whole thing is that anyone would ever believe that we would approve a dangerous, rogue pharmacy on purpose, " said Gabriel Levitt, PharmacyChecker's vice president.

WSJ: Google Was Warned on Rogue Drug Ads

Its purpose was to discourage Time magazine from publishing false allegations that Vice-President Dick Cheney was behind the trip, not to deliberately expose Ms Plame, he added.

BBC: NEWS | Americas | Bush 'supports' embattled adviser