It is important that how to employ limited cultivable areas to make per unit yield attain maximum without influencing ecological system and controlling production cost.
如何利用有限的耕地面积，在不影响生态平衡和控制生产成本的前提下，使单产达到一个新的水平，就显得尤其重要。
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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