Ntau xyoo ntawm kev ua haujlwm nyuaj tau them nyiaj, daim ntawv thov ozone tau txais hauv ntau cov ntaub ntawv thiab peb lub tshuab hluav taws xob ozone kuj tau lees paub tias yog cov khoom lag luam txhim khu kev qha nrog kev ua tau zoo hauv Suav teb.
Post lub sij hawm: Jun-11-2007