单语范例（未经PONS编辑处理）
英语
- This feeding provides a critical link within the global carbon cycle, linking trophic levels.en.wikipedia.org
- He researches carbon embedded emissions in international trade, energy systems, climate change mitigation, and the interactions of agriculture and the global carbon cycle.en.wikipedia.org
- This downloadable teaching resource contains green lesson plans, environmentally themed experiments, and green classroom activities on the carbon cycle, saving energy, recycling, and endangered animals.en.wikipedia.org
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英语