What do sewage and rainwater have in common?
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1 is all water; the other thing is that they always exist together. If you don’t believe it, use your phone to type in these two words. They are listed together!
Wastewater is very different from rainwater, right? If you just type it out, there’s no way to tell the difference; this is the gap between arts students and science students.
Believe it or not, I use a full keyboard input method. . . Wastewater is wushui, while rainwater is yushui ~~~;P;P;P;P;P
When rainwater falls into sewage pits or ditches, or comes into contact with oil stains on the ground, it becomes sewage as well.
Why are there separate systems for rainwater and sewage? Because the two are very different.
Wastewater is water that people consider to be dirty after it has been used. Rainwater, on the other hand, is different; it comes from the sky and has no source. It originates from the most yangful places, and it is very different from sewage.
Is rainwater what is referred to as water without a source?