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- 问题详情：Weproduce500billionofplasticbagsinayearworldwideandtheyarethrownawaypollutingoceans,killingwildlifeandgettingdumpedinlandfillswheretheytakeupto1,000yearstodecompose．Researchershavebeenunsuccessfullylookingforasolution.The16-year-oldCanadianhig...
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