abbr. Propulsion Auxiliary Control Box 
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bachelor's, bachelor's-button, bachelorship, Bachian, Bachmann, baciamano, bacile, bacilipin, bacillar, Bacillariophyta,
相似单词
pack-thread, packtrain, packwork, PACM, Paco, PACOB, pacoidoscope, PACS, pact, pactamycin,