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变个魔术来阻止水溢出玻璃杯。你可以利用空气压力密封住玻璃杯,而水一直在里面——即使你将杯子口朝下!
Become a magic trick to stop water from spilling out of the glass. You can use the air pressure to seal the glass, and the water is always there - even if you keep the cup down!