if you use a nail to make a hole in the bottom of this cup the bottom of the cup completely cracks but if you prepare a basin of water, put another identical cup completely under the water and use the same nail to make a hole at the bottom of the cup you will be surprised to find when the nail pierces the bottom of the cup the same cup bottom completely cracks you will be surprised to find when the nail pierces the bottom of the cup the same cup bottom completely cracks but if you prepare a basin of water and pour it into the water you will surprised to find when the nail pierces the bottom of the cup at that moment your cup bottom completely cracks but it is precisely pierced by the nail with a round mole 油圈会立马扩散成一个中空的圆环

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