1
per + 单位名词
The speed limit is 60 miles per hour.
限速为每小时60英里。
每
先理解核心含义，再看它在真实句子里的用法。
每
for each; for every
The speed limit is 60 miles per hour.
限速为每小时60英里。
每
For each.
每(用于表示单位比率)
To each, in each (used in expressing ratios of units).
通过(拉丁语身体部位名称)
By the, through the (with name of body part in Latin).
依照,按照
In accordance with, as per.
The speed limit on this road is 60 kilometers per hour.
这条路的速度限制是每小时60公里。
These oranges cost three dollars per pound at the market.
这些橙子在市场上每磅三美元。
She earns about two hundred dollars per day working as a guide.
她做导游工作每天大约挣两百美元。
The speed limit is 60 miles per hour.
限速为每小时60英里。
The work must be done per the specifications.
工作必须按照规格进行。
Not this
I will send the document per email.
Use this
I will send the document by email.
per表示'通过'时，通常指经由某种渠道，但现代英语中表示方式常用by；学习者易将中文'通过'直译为per，而忽略英语惯用by。
Not this
The cost is $10 per a hour.
Use this
The cost is $10 per hour.
per已包含'每一'的含义，后面直接跟单数名词，不需再加冠词a/an；中文学习者受'每一'影响，常误加冠词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
每天
The cost is $20 per day.
费用是每天20美元。
每人
The tour costs $50 per person.
这次旅行每人花费50美元。
每年
The interest rate is 5% per annum.
年利率为5%。
人均
The country's per capita income has increased.
该国的人均收入增加了。
本身；本质上
The law is not unjust per se.
法律本身并非不公正。
百分之...
Only 40 per cent of voters turned out.
只有40%的选民投票。
本身，本质上
The movie wasn't bad per se, but it was disappointing.
这部电影本身并不差，但令人失望。
人均
The country's per capita income has increased.
该国的人均收入有所增加。
每年
The interest rate is 5% per annum.
年利率为5%。
Use per naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象一个人说“per head”（每人），联想到“每”的意思，记住per表示“每一”。
通常用于正式或专业语境，如商业、法律或学术写作。
per表示'每一'，常用于单位或比例，如per day（每天）。
Dictionary facts from ECDICT, WIKTIONARY.