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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Its apparent viscous flow activation energy is higher so the influence of temperature on characteristics of melt is stronger.

由于其表观粘流活化能较大，故熔体特性受温度影响较大。

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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