Methods were developed .
Methods were tested to seed clouds to reduce the chance of rain during the image - defining opening and closing days and to wash pollution from the skies ( China Daily 2007c ; Xinhua 2007i ) .
Methods were developed and tested to seed clouds to reduce the chance of rain during the image - defining opening and closing days and to wash pollution from the skies ( China Daily 2007c ; Xinhua 2007i ) .