Words that are usually used to express the unit of quantity of people, things or actions are called quantifiers.

Quantifiers are divided into substance quantifiers and momentum words. Matter quantifiers represent the units of calculation of people and things, such as "ge" in "a person". Momentum words indicate the number of actions and the total time of occurrence, such as "times" in "see three" and "day" in "see three".

Quantifiers generally need to be used with units of measurement, such as a pig, a pig, you can't say a pig but you can say a door. The corresponding unit of things also needs memory.