When the external temperature rises, the gel component starts to break down and become less viscous, creating new pathways through which the sol can flow and speeding up the cell's movement.

当外部温度提高时，凝胶成分开始分解而且变得不那么粘性，创造了一个溶胶可以流动并且加快细胞移动速度的新途径。

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Coulees are formed from highly viscous, thick lavas that flow onto a steep surface.

当非常黏滞的稠密熔岩流经陡峭的地表时，就形成了熔岩流。

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The air outside the ball was ignored, and it was assumed that the air inside the ball behaved according to a compressive, viscous fluid-flow model.

分析假设球内空气的行为符合压缩、粘性流体流动模型。

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The primary difference between bitumen and ordinary crude is the size of the hydrocarbon molecules: in liquid oil, these molecules contain between five and twenty carbon atoms, while in bitumen they contain more than twenty. (At room temperature, pure bitumen is so viscous that it will not flow.) The main job of the upgrader is to break down the oversized hydrocarbons into smaller units.

NEWYORKER: Unconventional Crude