Population is a group of individuals of the same species that live in the same area.

種群是占有一定空間和時(shí)間的同一物種個(gè)體的集合體。

Community is a group of different populations that live together in a defined area.

群落是占有一定空間和時(shí)間的多種生物種群的集合體。

Ecosystem is all the organisms that live in a place，together with their physical environment.

生態(tài)系統(tǒng)是指在一定的空間內(nèi)生物成分和非生物成分通過(guò)物質(zhì)循環(huán)和能量流動(dòng)而相互作用、相互依存而構(gòu)成的一個(gè)生態(tài)學(xué)功能單位。