水控制着植物物质产量。
首先，每个新植物都要在控制中心存放6个月，以确保其健康。
First, each new plant is stored at the Control Centre for six months to make sure it is healthy.
人们提出了许多理论来解释食草动物，如浮游动物，在控制浮游植物高度集中地区的食草动物方面所起的作用。
Many theories have been formulated to explain the role of grazers such as zooplankton in controlling the excluded grazers from regions of high phytoplankton concentration.
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