发育起点温度及有效积温因不同龄期均有差异。

Development thresholds and accumulated temperatures vary owing to different instars.

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如混凝土强度的检测范围，不同龄期的影响及部分掺加剂对测试的影响等。

Such as testing the strength of concrete, not of the same age and some of the effects of phase mixing on the impact of the test.

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由于混凝土收缩徐变是随时间变化的，导致不同龄期的混凝土引起的效应有很大的区别。

As the change of shrinkage and creep for concrete is with the time, lead huge differences in the effects caused by concrete at different ages.

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