A less dense item generally occupies more volume of space, in comparison to its actual weight.
与它的实际重量相比，一个密度较小的物体一般占据更多的空间。
The Volume (weight) of thyroid calculated by SPECT were compared with actual volume of thyroid models.
将SPECT测定的结果与甲状腺模型实际体积进行统计分析。
The second advantage is that the actual weight of the international EMS billing, rather than billing by volume.
第二大优势在于国际EMS按实际重量计费，而不是按体积计费。
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