percent by volume 容积百分率 ; 体积百分数 ; 体积百分比
carbon monoxide percent by volume 一氧化碳容积百分率 ; 一氧化碳分析仪 ; 看看燃气一氧化碳容积百分率
Average daily volume in International Priority packages grew 18 percent, led by exports from Asia.
国际优先级包裹的日平均数量增长了18%，主要来自亚洲的出口。
By volume, only two percent of freight is shipped via air; by value, that’s 35 percent.
按体积计算，仅有两成的货品依赖航空运输；但若以价值计算，空运则可占据35%的份额。
After a year, brain scans showed that among the walkers, the hippocampus had increased in volume by about 2 percent on average; in the others, it had declined by about 1.4 percent.
1年以后，大脑扫描显示，参加走步训练的人员海马状脑凸体平均增长了大约2%，而另一组人员却下降了大约1.4%。
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