Pour some water inside, blow the straw, water will come out from the other one.
YJ showing me and YF.
Fill the bottle with water, turn over, the water will not drop!
YJ showing..
This one, I still don't understand why.. :-P
Fill the bottle with water, there is a pump inside, with half air on top.
press the bottle with hand, the pump inside will go down, even with air. Why?
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