A2 used when expressing rates, prices, or measurements to mean "for each"每,每一
More examples
They cut 2p per litre off the price of unleaded petrol.
It costs a staggering $50,000 per week to keep the museum open to the public.
In China, the policy of one child per family was introduced to stabilize the country's population at 1.6 billion.
The train sped along at over 120 miles per hour.
The computer screen displays 80 characters per line.
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