一遞一聲

(of singers etc) one answering the other

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

to hand over / to pass on sth / to gradually increase or decrease / progressively

to hand over; to pass on; to deliver / (bound form) progressively; in the proper order

first tone in Mandarin (high, level tone)

sound / voice / tone / noise / reputation / classifier for sounds