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1.The study of trophic levels is crucial for understanding ecosystems.
研究营养级对于理解生态系统至关重要。
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2. The trophic levels in the food chain are determined by the energy available to each organism.
食物链中的营养级由每个生物体可利用的能量决定。
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3. The trophic levels in a food web can vary greatly depending on the resources available.
一个食物网中营养级的变化很大程度上取决于可用资源。