谁还没被什么“挑战”击中过？

　　Thousandsofyearsago,humankindbegantofacechallengesinvariousaspects.Notonlyphysicalones,butalsosocialandintellectualchallenges.Somechosetoconfrontdangeronthebattlefield,otherstoinventmarvelsthatwouldeasehumanlabor.Allofthemrelishedthethrillofchallenges.

　　Whydopeoplelovethesechallengessomuch？Thereareatleasttworeasons.First,there'scuriosity.Second,there'sthepersonalfeelingofachievement.Andforsome,it'sevenabusinessproposition.

　　Today,challengesstillloomlargebeforeus.Medicalsciencemustconquerdiseasesthatstillclaimhumanlives.Engineersandurbanplannersmustbuildnewcities,designbettertransportation,anddevelopnewenergysources.Weliveinanageofconstantchallenges.

　　Butchallengesarenotjustobstacles.Theyareopportunitiesforgrowth,innovation,andprogress.Withoutchallenges,lifewouldgrowstagnantlikeaplantthatneverbendsthewind.So,letusembracethesechallengeswithcourageandintelligence,andtogether,wecanconquerthem.