percentage by volume

The bulk fraction is a mixture of methane, carbon dioxide, hydrogen, nitrogen and oxygen. These are measured in terms of percentage by volume.

主要成分是甲烷，二氧化碳，氢气，氮气和氧气的混合气体，这些成分的含量一般用所占填埋气的体积比来表示。

It is calculated as the percentage increase in output that is not accounted for by changes in the volume of inputs of capital and Labour.

他计算的产出增长百分比不把资本投入规模和劳动投入规模的变化计算在内。

For more than three decades, the sales volume of existing single-family homes and newly built houses tended to rise and fall by about the same percentage, as can be seen in the accompanying charts.

从随附的图标中我们可以看到在这超过三十年中，单亲家庭旧房销售量和新建房屋销售量上升和下降的百分比趋于相同。