課堂翻譯一 46-1-1

Ecologists assign every organism in an ecosystem to a feeding level ,or trophic level,depending on its source of food or nutrients. Producers,sometimes called autotrophs(self-feeders),make the nutrients they need from compounds and energy obtained from their environment.

生態學者認為每個生物在生態系中的哺食階層和營養階層它所依靠的來源是食物和營養物。生產者有時又稱自營生物他們製造他們自己所需的能量和營養物於他們所在的環境。