The swell factor tends to decrease if the cross section of die crown is large, the die round R is small, the runner is large, the dumping temperature is high and the extrusion speed is low;

口型的冠部截面大、口型圆角R小、流胶口大，排胶温度高，挤出速度慢，则膨胀因数小；

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Many factors are affecting results in short RACES, of which technical pressure in a runner's high speed racing can greatly hinder the progress of a short race runner.

影响短跑成绩的诸多因素中，运动员高速跑中的技术紧张是阻碍短跑水平提高的重要因素之一。

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Many factors are affecting results in short RACES, of which technical pressure in a runner's high speed racing can greatly hinder the progress of a short race runner.

影响短跑成绩的诸多因素中，运动员高速跑中的技术紧张是阻碍短跑水平提高的重要因素之一。

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