同一

identical / the same

like / same / similar / together / alike / with

see 衚衕|胡同[hu2 tong4]

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

(coll.) to have a lot in common (with sb) / to get along well with each other

gender identity disorder

One world - one dream, motto of 2008 Beijing Olympic games