Over a three-month period, there was no statistically significant difference in injury risk between the pre-run stretching and non-stretching groups.

在三个月中，两个群体之间在伤害风险统计上没有太大的区别。

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For the process of the fiber taper drawing, the pre-heating time and stretching speed are carefully examined for parameter optimization.

在加热拉伸过程工艺方面，本文从预加热时间和拉伸速度两个角度进行研究，对参数进行优化处理。

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The effect of quenching temperature, the interval time from quenching to aging and aging institution to 2A70 aluminium alloy pre-stretching plate structure and properties are introduced.

介绍了固溶处理温度、淬火到时效间隔时间及时效制度等对2A70铝合金预拉伸厚板组织和性能的影响；

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Apart from competition from the well-established A-level, the new qualification could also be rivalled by another proposed exam, called the Pre-U, aimed at stretching pupils planning to enter higher education.

BBC: Heads demand answers on Diplomas