More than half of the UnitedStates' 104 reactors were licensed more than 30 years ago and constructed under safety codes less demanding than the ones applied to new reactors today.
The UnitedStates calls them ZIP Codes, for example.
例如，美国将邮政编码称为ZIP Code。
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Research in Boulder, Colo., said they were planning to work with the Japanese earth simulation center to convert UnitedStates weather modeling codes to work with the new computer.