一是一，二是二

lit. one is one, two is two (idiom) / fig. things are (or ought to be) perfectly clear-cut / unequivocal

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

variant of 是[shi4] / (used in given names)

to be (followed by substantives only) / correct; right; true / (respectful acknowledgement of a command) very well / (adverb for emphatic assertion)

two / 2 / (Beijing dialect) stupid