per

1. We were bowling along (the motorway) at seventy miles per hour.
   我们以每小时七十英里的速度(在高速公路上)飞驰。
2. The vessel tax of anchorage is 5,000 dollars per year.
   这艘船的停泊税一年是五千美元。
3. Public houses are licensed to sell alcoholic drinks for a certain number of hours per week.
   酒店执有酒类经销许可证，每周可按一定时数出售。
4. He told me that middle C is equivalent to 256 vibrations per second.
   他告诉我说中央C音相当于每秒振动256次。
5. Force applied uniformly over a surface, measured as force per unit of area.
   压力; 压强统一作用于物体表面的力量，用每一单位面积上的压力计量
6. The hurricane has a speed of 73 miles per hour.
   飓风每小时73英里。
7. Out of each hundred; per hundred.
   百分之出于每一百; 每一百
8. These apples cost five yuan per kilogram.
   这些苹果每公斤五元。

per

prep.Abbr. p.（介词）缩写 p.
To, for, or by each; for every:
每一，每：对、为或通过每一个；每一个：
例句：
Gasoline once cost 40 cents per gallon.
汽油曾卖到每加仑40美分

Usage Problem According to; by:
【用法疑难】 根据；依照：
例句：
Changes were made to the manuscript per the author`s instructions.
根据作者的提示，手稿做了改动

By means of; through.
经，由：以…方式；通过
adv.Informal （副词）【非正式用语】
For each one; apiece:
每一个地：为每一个；每个，每人：
例句：
sold the cookies for one dollar per.
蛋糕卖一美元一块

Per hour:
每小时地：
例句：
was driving at '0 miles per.
以每小时'0英里的速度开车

来源：
Latin * see per
拉丁语 *参见 per

Per is appropriately used in the description of ratios (
Per 适用于描述比率(
例句：
five miles per day;
five miles per day;

例句：
20 dollars per person).
20 dollars per person)。

In its more general use to mean .according to. (as inper the terms of the contract ), it is best reserved for business and legal communications,unless the writer seeks a tone of jocular formality.
更普遍的意思是.根据.（如见 per the terms of the contract )， 最适于商业和法律交流，除非作者想寻求一种滑稽的正式口吻