分子量取决于分子中的原子种类与数量。
The kind and number of atoms ina molecule determine a molecular mass.
现阶段，不同国家或区域之间商品交流的种类与数量日益增大。
Nowadays, the classes and quantities of Commodity Exchange among different countries are increasingly larger through international trade.
对天水四门大曲太空搭载前后微生物的种类与数量的变化进行了研究。
The changes of microbe species and quantity in Simen Daqu before and after carried to the space were reported in this article.
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