bata_yhy
花朵
共回答了26个问题采纳率:84.6% 举报
第2便:
the process of turning polluting water into clean water are complex. firstly, dirty water is processed through factores, after that, these water are dumped into river, and then, sea. after all these, water vaporize into cloud, and then, to river again.
lastly, it get processed with water producer, and then, it passes on to our houses.
1年前
2