想請問一下一個問題
我帶保溫杯買咖啡時
可能因為保溫杯比較高
店員先拿一個杯子裝咖啡
再倒進我的杯子裡
我看了一下
杯子上有貼一張紙說是city cafe 專用杯
請問那個杯子是什麼材質的
有人知道嗎？
謝謝
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