per [pə(r)]

以下由轻松背单词网站提供

prep.每，每一，根据，按照；由，经，以，靠

used when expressing rates , prices or measurements to mean for each

These apples cost 40 pence per pound. 这些苹果每磅40便士。
The truck was traveling under fifty miles per hour. 那辆卡车以每小时不到五十英里的速度行驶着。