这是平行四边形的对边。
这些星星组成了一个平行四边形-对边等长且平行的四边形。
These stars form a parallelogram – a four-sided figure with its opposite sides equally long and parallel to one another.
通过算例，清楚地显示了流动的非平行性对边界层稳定性的影响。
The examples presented clearly show the effect of nonparallel flow on boundary layer stability.
通过算例，清楚地显示了流动的非平行性对边界层稳定性的影响。
The examples presented clearly show the effect of nonparallel flow on boundary layer stability.
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