an image from the US government EPA "Sunwise" program. I converted it from PDF format, and removed all the "sunwise" logos. the source link is here - http://www.epa.gov/sunwise/doc/mission_story.pdf
望著窗外的孩子們
child、epa、epa sunwise、kids、outside、park、play、playground、shade、window
兒童、EPA、epa sunwise、孩子、外、公園、玩、操場、陰涼處、窗口
資料來源：openclipart ( https://openclipart.org/ )