[問題] 思樂冰
思樂冰是款經典產品，在重量杯和手搖店的夾殺下，
目前還生存著。
雖然年紀大了，偶爾還是會買一杯來喝喝。
前幾年，思樂冰改用環保材質的玉米來製作杯子，
今天再買時，想說應該還是走環保風吧，
結果杯子底部說明已經變成PLA 7號 聚乳酸塑膠
請問達人，為什麼不繼續使用玉米材質呢????
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