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400字世界卫生日英语作文：世界卫生日
onjuly22,1946,theunecosocheldaninternationalhealthconferenceinnewyork,morethan60countriessignedthecharteroftheworldhealthanization,theworldhealthanization(who)chartertakeeffectonapril7,1948.byday,tomemoratetheanizationcharterinjune1948,theunitednationsingenevaonthefirstworldhealthassemblywasformallyestablishedtheworldhealthanization(who),anddecideonjuly22,fromyeartoyearwouldbea"worldhealthday",theinitiativecountriesholdmemorativeactivities.thefollowingyear,thesecondsessionoftheworldhealthassemblyconsideringmostofthenationalschoolhassummervacationinjulyeachyear,unabletoattendthecelebration,andregulationssince1950onapril7,asaglobal"worldhealthday".