alternate

vt.轮流

alpha ray, alphabet, alphabetic, alphabetical, alphabetically, alphabetize, alpine, alpinist, already, alright, Alsatian, also, also-ran, altar, altar-piece, alter, alter ego, alterable, alteration, altercation, alternate angles, alternately, alternating current, alternation, alternative, alternatively, alternator, although, although (US also altho), altimeter, altitude, alto, altogether, altruism, altruist, altruistic, altruistically, alum, aluminium, aluminum,