Urine is filtered from blood in kidneys. It plays an important role in the Earth's nitrogen cycle. It's also an important source of medications.
-sailor(Ocean & Mountain);
2021-5-2(#13672539@0)
你打算让谁喝?
-lzh0007(lzh0007);
2021-5-2(#13672766@0)
I drank my own.
-sailor(Ocean & Mountain);
2021-5-2(#13672778@0)