液体的颜色似乎在流动，像个自由的灵魂，又像个脱窍的仙子。
The color of the liquid appears to flow like a free soul, but also like a fairy off awakened.
本文对未充满液体具有部分自由液面的圆管内的流动提出一种理论计算方法。
This paper proposes a theoretical method for calculating the flow within a circular pipe which is not filled up with fluid and thus has a partially free surface.
液体能自由流动，无固定形态。
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