生态学家使用“演替”一词来指植物群落和生态系统随时间发生的变化。

Ecologists use the term "succession" to refer to the changes that happen in plant communities and ecosystems over time.

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这份来自生物多样性和生态系统服务政府间科学政策平台（IPBES）的报告明确指出了什么是利害攸关的以及什么需要改变。

The report from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) is clear on what's at stake and what needs to change.

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这种美丽的熊和生态系统的每一层都有着联系。

The beautiful bear used all layers of the ecosystem.

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