…당, …마다
For each unit of something
예문:
"The gym membership is fifty dollars per month."
"The speed limit is 100 kilometers per hour."
"We need one laptop per student."
…에 의하여, …로
By means of or through
예문:
"The package was sent per air mail."
"Instructions were delivered per messenger."
…에 따라, …대로
In accordance with or according to
예문:
"The results were calculated as per the new formula."
"The event went ahead as per the schedule."