比例

在数学中，比率是指同一类（例如，物体、人、学生、匙、任何相同维度的单位）的两个数之间的关系，通常表示为“a to b”或a:b，有时用算术方式表示为两者的无量纲商，明确地表示第一个数包含第二个数的次数（不一定是整数）。

In mathematics, a ratio is a relationship between two numbers of the same kind (e.g., objects, persons, students, spoonfuls, units of whatever identical dimension), usually expressed as "a to b" or a:b, sometimes expressed arithmetically as a dimensionless quotient of the two that explicitly indicates how many times the first number contains the second (not necessarily an integer).