human wastes

例句：

1. 1. The city has been working hard to reduce its human wastes.
   该城市一直在努力减少其人类废物。
2. 2.The government is considering introducing a new law to control the disposal of human wastes.
   政府正在考虑引入一项新法律来控制人类废物的处置。
3. 3. The scientists are studying how to recycle human wastes for energy.
   科学家们正在研究如何将人类废物回收用于能源。