After the payment process is complete, the relevant information should be appended to a log file.
错误
模糊
The system should be constructed so that it will be easy to add new functionality in the future.
错误
模糊
The price of a gasoline purchase is computed as the price per gallon for the type of gas purchased, multiplied by the number of gallons purchased (use two decimal points for representing fractions of gallons).
正确
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The system should be available 24 hours a day, 7 days a week.
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