“MPOS”是“Mobil Post Office Society”的缩写，意思是“

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“TPO”是“Travelling Post Officer”的缩写，意思是“旅行

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“RTAG”是“Regional Technical Advisory Group”的缩写，

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“LSB”是“Lutheran Service Book”的缩写，意思是“信义宗

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“ICEA”是“Insulated Cable Engineers Association”的

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“CENI”是“Command, Example, and Necessary Inference

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“KAE”是“Kimberlin Academy for Exellence”的缩写，意

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“CORPA”是“Council on Recognition of Postsecondary

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“FDC”是“First Day Cover”的缩写，意思是“第一天封面”

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“ANA”是“American Numismatic Association”的缩写，意

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