Pick Ecological system is one of the main area ecology structural and functional unit, belong to the highest level of ecology.
生态系统是生态学领域的一个主要结构和功能单位，属于生态学研究的最高层次。
Power plant is the major unit of thermal discharge, and we must pay much attention to the impact on the ecological environment of receiving water.
电厂是废热水的主要排放单位，其对受纳水体生态环境造成的影响应给予足够的重视。
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