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。
The utility model uses lever principle, when a drinker inclines a cup, the iron rod in the plastic jacket shell rolls to open the plastic cover sheet, and the drinker can drink water.
它利用杠杆原理，当喝水者倾斜杯子的瞬间，塑料套壳内的铁棒滚动时打开塑料盖片，喝水者即可喝水。
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