一一映射

bijective map (i.e. map between sets in math. that is one-to-one and onto) / one-to-one correspondence

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

one by one / one after another

to reflect (light) / to shine / to project (an image onto a screen etc)

old variant of 映[ying4]

to shine on / (math., linguistics etc) mapping

old variant of 射[she4]

to shoot / to launch / to allude to / radio- (chemistry)