因为沿底部运动的异重流与上部较轻的流体置换，必须产生一种力来克服边界阻力。
Because the stream moving along the bottom displaces the lighter fluid upward, a force must be provided to overcome boundary resistance.
因为沿底部运动的异重流与上部较轻的流体置换，必须产生一种力来克服边界阻力。
Because the stream moving along the bottom displaces the lighter fluid upward, a force must be provided to overcome boundary resistance.
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