Aq meaning aqueous, or in solution, and s for solid, meaning that it's your precipitate, this is called the molecular equation.

Aq 表示水溶液， 或在溶液中，而 s 表示固体， 表示它是您的沉淀物， 这称为分子方程式。

From the molecular equation we can see that in order for it to balance we'll need one mole of sodium chloride for every mole of silver.

从分子方程式我们可以看出， 为了使其平衡，每摩尔银需要一摩尔氯化钠。