的向上或向下流动的市场，在一段时间。
The upward or downward movements of a market, during a period of time.
测试流体粘度的一种仪器，在实验中使流体在已知压力梯度或流速情况下流过已知直径的一段试管。
An instrument for measuring the viscosity of a fluid by passing the fluid at a known pressure gradient or velocity through a length of tubing of known diameter.
佛陀看见一段很大的木头，被恒河的水流带着向下流去。
The lord Buddha saw a very big log being carried down the river by the current.
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