该技术利用液流浮力变化驱动浮体升降来控制排水通道的开闭。
This technology is using current buoyancy change, floating body to control drain switch of passageway.
有不同形状浮体可选择：水滴形（不倒翁形）在急流中更稳定；
Supply many different patterns : water drop shape(tumbler shape)is most steady in torrent;
浮体排开一定量的水，其重量等于浮体的重量。浮体所排开水的重量等于其自身的重量。
A floating object displaces an amount of water whose weight equals that of the object.
浮体排开一定量的水，其重量等于浮体的重量。浮体所排开水的重量等于其自身的重量。
A floating object displaces an amount of water whose weight equals that of the object.
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