發生

to happen / to occur / to take place / to break out

to happen; to occur; to take place; to break out

to send out / to show (one's feeling) / to issue / to develop / to make a bundle of money / classifier for gunshots (rounds)

to be born / to give birth / life / to grow / raw / uncooked / student

rate of occurrence

to have sexual relations with sb / to have dealings with

to reoccur

morphogen

embryogenesis