優勝劣汰

survival of the fittest (idiom)

excellent / superior

winning / superior

(of a contestant) winning; superior; excellent

victory / success / to beat / to defeat / to surpass / victorious / superior to / to get the better of / better than / surpassing / superb (of vista) / beautiful (scenery) / wonderful (view) / (Taiwan pr. [sheng1]) able to bear / equal to (a task)

inferior

elimination of the weakest

to discard / to eliminate