（生态系统的）营养级each of several levels in an ecosystem(= all the plants and animals in a particular area and their relationship with their surroundings) . Each level consists of living creatures that share the same function in the food chain and get their food from the same source.
un.
1.
营养水平
n.
1.
astageinafoodchainthatreflectsthenumberoftimesenergyhasbeentransferredthroughfeeding, e.g. whenplantsareeatenbyanimalsthatareinturneatenbypredators.