类似地，化学方程式中要先写元素名字后写个数，而不是反着。

Similarly, in a chemical formula the subscript comes after the element name, not before.

youdao

类似地，化学方程式中要先写元素名字后写个数，而不是反着。

Similarly, in a chemical formula the subscript comes after the element name, not before.

youdao