“生态系统是一个统一整体”是教学的难点,于是我引导学生重点从“生产者、消费者、分解者、非生物的物质和能量”之间的关系尝试建构出生态系统的结构模型,阐释了生态系统中各组成成分之间紧密联系构成一个统一整体,体现出一定的结构和功能。 “Ecosystem Is a Unified Whole” is a difficult teaching point, so I guide students to try to construct an ecosystem based on the relationship between “producer, consumer, decomposer, non-living matter and energy.” The structural model explains that the close relationship among the various components in the ecosystem constitutes a unified whole and reflects certain structures and functions.