单词：carbon cycle
carbon cycle的用法和样例：
例句
- The carbon cycle has thus acquired another epicycle, and become even more complicated to understand than it was.碳循环因此又得纳入另一个亚循环，以致变得更加复杂难以理解。
- Microbes and plants play substantial roles in the global cycling of carbon through the environment.各种微生物与植物透过环境在全球总体碳循环中扮演重要角色。
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