Ua tsaug cov neeg siv khoom tshiab thiab qub rau kev mus saib peb hauv 133rd Canton Fair. Sinowin cov khoom lag luam thiab cov kev pabcuam tau raug lees paub thiab qhuas los ntawm cov neeg siv khoom loj. Peb tseem yuav muab cov khoom lag luam zoo rau cov neeg siv khoom lag luam zoo, SDIC, calcium hypochlorite, PAC, PAM.
