non-stationary flow的用法和樣例：
例句
- It describes unsteady flow toward a discharging well in an extensive aquifer.
它描述位于廣闊含水層中的抽水井的非穩定流。 - Difference model for calculating formation pressure of oil wells at multireservoirsingle phase unstable radial flow condition is established.
本文建立了多油層徑向單相不穩定流條件下油井地層壓力計算的差分模型。
