文章通过对科学实验修辞的理论依据、制约境遇、操作规则、劝导力量等内容的探讨，论述了科学实验中的修辞问题。

Through the study of theory basis, conditional context, operating rules and persuading power, the thesis discussed the rhetoric problem in scientific experiment.

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本文以科学实验为依据，提出了如何提高螺纹连接件抗拉疲劳寿命的措施和方法。

Based on experiments, the paper also brings forward the measures and methods of how to improve the anti-fatigue life of threaded connecting joints.

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