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a.主要的，最重要的 n.干线?

maiden aunt, maiden name, maiden speech, maiden voyage, maidenhair, maidenhead, maidenhood, maidenly, maidservant, mail, mail order, mail-bag, mail-order, mailbox, mailed, mailer, mailing list, mailman, mailshot, maim, main clause, main deck, main drag, main line, mainbrace, mainframe, mainland, mainline, mainly, mainmast, mainsail, mainspring, mainstay, mainstream, maintain, maintain contact with, maintenance, maintenance order, maisonette (also maisonnette), maitre d'hotel,