Harvardresearchershavecreatedatough,low-cost,biodegrada...
问题详情：Harvardresearchershavecreatedatough,low-cost,biodegradable(可生物降解的)materialinspiredbyinsects"hardoutershells.Thematerial"sinventorssayithasanumberofpossibleusesandsomedaycouldprovideamo...