自然淘汰

(1)the process of becoming obsolete; falling into disuse or becoming out of date; "a policy of planned obsolescence"

(2)時代遅れになる過程

(3)使われなくなうる、または時代遅れになること

(4)a natural process resulting in the evolution of organisms best adapted to the environment

(5)最も環境に適するよう生物の進化をもたらす自然な過程