When the drinker puts down or carries the cup, the iron rod in the jacket shell rolls using a slope on the bottom of the jacket shell, and the plastic cover sheet covers the cup naturally again.
当喝水者放下或端平杯子时,套壳内的铁棒利用套壳底部的斜面滚动,塑料盖片复又自然盖住杯子。
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