We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.

我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。

麻省理工公开课 - 固态化学导论课程节选

We write it subject to conservation of mass.

要服从质量守恒定律。

麻省理工公开课 - 固态化学导论课程节选

What I am going to do next day is go into the larger stoichiometry and understand the principles of mass balance and reactivity But before you go,hold it,I don't want you racing off.

下堂课我要做的是,讨论化学计量学，和,质量平衡很反应定律,但在下课之前，我不希望你们这么快走。

麻省理工公开课 - 固态化学导论课程节选