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因为咖啡杯有“耳朵”，水杯没有。
Because coffee cup, no ears.
youdao
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专业生产：玻璃咖啡杯、玻璃水杯，茶杯、冲茶器、双层杯。
Professional production: glass coffee cup, water glass, teacup, blunt tea device, double cup.
youdao
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专业生产：玻璃咖啡杯、玻璃水杯，茶杯、冲茶器、双层杯。
Professional production: glass coffee cup, water glass, teacup, blunt tea device, double cup.
youdao