Ask those interested to press down on the surface of the water with their hands, to see how the level of the water rises and then falls when they press down or let up.
问到有兴趣的手按压其表面的水，看看如何在水平提高的水，然后按下时跌倒或松懈。
Ask those interested to press down on the surface of the water with their hands, to see how the level of the water rises and then falls when they press down or let up.
问到有兴趣的手按压其表面的水，看看如何在水平提高的水，然后按下时跌倒或松懈。
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