raw wastewater

例句：

1. 1. The city has implemented strict regulations to reduce the amount of raw wastewater discharged into the river.
   该市已实施严格规定，以减少流入河流的原始污水量。
2. 2. The treatment plant is designed to efficiently remove pollutants from raw wastewater before it reaches the sea.
   处理厂设计用于从原始污水中高效去除污染物，使其在排放到大海之前得到净化。
3. 3. The raw wastewater needs to be treated before it can be safely released into the environment.
   原始污水需要经过处理后才能安全排放到环境中。