值类型

An entity is a value, object, subobject, base class subobject, array element, variable, function, instance of a function, enumerator, type, class member, template, or namespace.

实体是个值，对象，子对象，基子对象，数组元素，变量，函数，函数实例，枚举符，，成员，模板，或名字空间。

On the other hand, floating types have density much smaller than 1, which means that there are real numbers unrepresented between consecutive floating values (i.e. there are gaps).

面，点密度远小于1，这意味着在相邻点值之间存在无法表示实数(即有定间隙)。