在节省用水方面， 灰色水系统 （ Grey Water System ）将洗澡和淋浴用水收集起来重用冲厕所，可以节约房屋内总用水量的三分之一；屋外装屋檐排下雨水收集桶；草地地区大量种植耐旱植...
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The water used in that ritual is considered "grey water" and simply enters the sewerage system, furthering adding strain to the already scarce water supply in the country.
仪式中所用之水被认为是“晦水”而直接流入排污系统，这进一步加剧了这一本已缺水国家的供水紧张状况。
The wetland water environment system is a grey system.
湿地水环境系统是一个灰色系统。
This paper inserts grey system, makes use of finite time series, follows GM (1, 1) building method, builds the long term prediction model of total waste -water in Heilongjiang Province.
本文引入灰色系统理论，利用有限的时间序列，按照GM(1,1)建模方法，建立起黑龙江省污水总量长期预测模型。
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