A water quality pilot study,being conducted jointly by WHO and UNICEF during 2002-2003 in nine countries,will test both the microbial and chemical quality of the water at the source as well as in the household.是什么意思_A water quality pilot study,being conducted jointly by WHO and UNICEF during 2002-2003 in nine countries,will test both the microbial and chemical quality of the water at the source as well as in the household.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句