source and sink theory

例句：

1. 1. The theory of the source and sink is fundamental to understanding the dynamics of ecosystems.
   源与汇理论是理解生态系统动态的基础。
2. 2. The researcher proposed a new theory that could explain why certain species are more likely to be found in the source or sink regions.
   研究者提出了一个新的理论，可以解释为什么某些物种更有可能出现在源或汇区域。
3. 3. The theory of the source and sink has been widely applied in environmental science to study the impact of humanactivities on natural systems.
   源与汇理论在环境科学中被广泛应用，用于研究人类活动对自然系统的影响。