Seng-bu̍t-ha̍k só͘ kóng ê sek-èng (Eng-gí: adaptation) sī seng-bu̍t ián-hoà ê koè-têng, ē hō͘ chéng-kûn (population) koh-khah sek-ha̍p î-ê chhe-tē. Seng-bu̍t-ha̍k siōng ê sek-èng sī ài keng-koè liân-liân sè-tāi sán-seng ê koè-têng.
