头围是大脑体积的一个衡量指标，所以新生儿头围越大，表明他们的大脑发育越快。
Head circumference is an indicator of brain volume, so a greater increase in head circumference in a newly-born baby suggests more rapid brain growth.
然而体积大重量重是背投系统致命的弱点，系统厚度和质量也是衡量背投系统实用性的重要指标。
Whereas, the large volume and heavy weight are fetal to the system, which are crucial factors to evaluate it.
可以以初始体积吸水率作为衡量混凝土耐蚀能力的标准，降低初始体积吸水率可以提高混凝土的耐蚀能力。
And the original volumetric water absorption can be regarded as a criteria to evaluate the resistance of concrete to salt physical attack.
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