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.
当你跨组织边界的时候就会遇到很大的阻力，特别是在业务和IT组织之间。
There is a huge impedance mismatch as you cross an organizational boundary, particularly the boundary between the business and IT organizations.
大部分的阻力产生于混乱和不可预知的自然边界层之间在物体和气流之间。
Most of this drag is a result of the chaotic and unpredictable nature of the boundary layer - the layer immediately between the object and the airflow.
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