So much our discussion in school is centered around ecological systems.

我们在学校中的许多讨论都是围绕生态系统进行的。

River basin is an integrated ecological system, and consists of many ecological systems.

流域是一个完整独立的生态系统，这个系统由不同的生态系统组成。

Tigers are an indicator of the health of the varied ecological systems of which they are part.

老虎是多样化生态体系的组成部分，也是其健康与否的一个标志。

The biological components of ecological systems include producers, consumers and decomposers.

生态系统中的生物成分包含生产者、消费者和分解者。

Many physical and ecological systems are being affected by the world's warming climate, researchers say.

据研究者声称，许多自然生态系统都受到了全球气候变暖的影响。