That is because of the volume of material involved and the way the plants work.
原因在于所涉燃料的数量以及工厂的工作方式。
Each volume is in a different colour or material.
每个体量都使用不同的颜色或材料。
Carton weight, size, volume, content, material.
纸箱重量，大小，数量，内容，材料。
In physics it is an identification of material by noting its mass per unit volume.
在物理学上，是以每单位体积的质量来鉴别物质。
So, the world must exist small volume of material than electromagnetic waves.
那么，世界上肯定存在比电磁波体积小的物质。
Carton weight, size, volume, content, material. It is very important!
外箱重量，尺寸，体积，内容，材料。这非常重要！
Carton weight, size, volume, content, material. It is very important!
外箱重量，尺寸，体积，内容，材料。这非常重要！
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