In actual, natural conversation, Chinese applies tone sandhi (tone change rules). Because 般 (bān) is a 1st-tone character, the tone of 一 shits to a 4th tone (yì) to make the phrase easier to say.
(numerical) one
(numerical) single, alone; only one
(adj) same
(adj) whole; all; throughout
(adj) concentrated; wholehearted
(adv) every time
(particle) used in the middle of a reduplicated verb
(adv) used before a verb or a verbal measure
(particle) same as; just like
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