They can also charge high fees from students from outsidetheir official catchment areas.
他们还可以不通过官方形式来收取费用.
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For catchment areas greater than gutter capacity, slotted holes can be installed.
如果汇水面积大于天沟排水能力, 可以在天沟底部打孔.
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快速识别流域内生态缺水严重的区域、动态评估生态用水状况对流域生态环境建设和水资源优化配置具有重要意义。
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