Ratio

A relationship between two Quantity values expressed as a numerator and a denominator. A proper ratio has both a numerator and a denominator; however, these are not mandatory in order to allow an invalid ratio with an extension with further information.

两个数量值之间的比率关系，以分子与分母的形式表达。一个恰当的比率应当具备分子与分母，然而，为允许包含额外信息的无效比率，分子与分母并非强制要求。