以o结尾的而o前是元音字母的单数名词,在字尾加s就变为复数, 如:radio, radios.
(f) 以o结尾的而o前是辅音字母的单数名词变成复数时,应加es, 如:
buffaloes, calicoes, cargoes, dominoes, echoes, embargoes, heroes, jingoes, mosquitoes, mottoes
(mottos), mulattoes, potatoes, tomatoes, tornadoes, torpedoes, volcanoes.
但有例外如:
banjos, bolos, cantos, contraltos, dynamos, gigolos, octaves, pianos, quartos, silos, solos, sopranos, zeros.
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