fraction by volume

例句：

1. 1. The engineer calculatedthe fraction of the material to be usedfor the new building.
   工程师计算了用于新建筑的材料的体积分数。
2. 2. The scientistdiscovered a fraction of the molecules in thesample that reacted with the dye.
   科学家发现了样本中与染料反应的分子的一部分。
3. 3. The chemist determined the fractionof the solution that was acidic.
   化学家确定了溶液中酸性部分的比例。