trophic level的用法和樣例：
例句
- Rational soil fertilization could improve soil nutrition and leaves nutritious level.
本實驗的施肥試驗表明，合理的土壤施肥可以提高土壤營養和葉片營養水平。 - Ecologists assign every organism in an ecosystem to a feeding level,or trophic level,depending on its source of food or nutrients.
生態學家分配在生態系的每個有機體到一個哺養的水平或者食性層次，根據它的食物或營養素的來源。
