1. After decades of treatment, the water quality of Suzhou River in Shanghai has reached the level of 4-5. There are many pollution sources on the Thames, including domestic washing machines. When people wash clothes containing nylon, vinegar and acrylic acid, millions of plastic microfibers will fall off.
2. The government funded the construction of a park to commemorate the water quality control of Suzhou River. The water quality of the river is good, and the Thames is neglected and seriously polluted.