天吃星星蒂小娜
帮你google了下，下面是英文的注解：A ratio is a comparison of two numbers. We generally separate the two numbers in the ratio with a colon (:). Suppose we want to write the ratio of 8 and 12.We can write this as 8:12 or as a fraction 8/12, and we say the ratio is eight to twelve.Example:Jeannine has a bag with 3 videocassettes, 4 marbles, 7 books, and 1 orange. Proportion:A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.3/4 = 6/8 is an example of a proportion.When one of the four numbers in a proportion is unknown, cross products may be used to find the unknown number. This is called solving the proportion. Question marks or letters are frequently used in place of the unknown number.Example:Solve for n: 1/2 = n/4.Using cross products we see that 2 × n = 1 × 4 =4, so 2 × n = 4. Dividing both sides by 2, n = 4 ÷ 2 so that n = 2.意思大概为，ratio是指两个数的比值，并且有冒号或以分式的形式约束。比如8：12或8/12，这是比率，即ratio。而proportion是指一个等式，并且在等号的两边有相同比例的述。如8/12=2/3。祝学习进步~
昵称真是醉了
ratio:一般是指两个数字的比例 例子：水与面粉的比例是1：2; 1杯水：两杯面粉proportion:是指A part considered in relation to the whole， 一块皮萨是一整个皮萨的八分之一：1/8rate:A quantity measured with respect to another measured quantity; 一个单位比另一个单位：每小时六十公里： 60km/hrpercentage:百分比: 90% (很多时候，porportion就是用percentage来表达的）scale:A standard of measurement or judgment; a criterion; 最简单的说法就是比如你看一张地图的时候，地图上会有一个小标志指明一英寸代表1公立，这里的scale就是说一英寸就是着这样地图的“单位”，整张地图就是按照这个单位来用的。
