However, under these circumstances cholinesterase would enter the saliva by simple diffusion and therefore activity should be correlated with salivary flow rate.

在这样的情况下乙酰胆碱酯酶将以简单扩散的方式进入唾液，因此它的活性必将和唾液流量速率相关。

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Nevertheless, temperature has a very significant effect on the rate of diffusion.

但是温度对扩散速度却有非常大的影响。

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Combining several techniques enables researchers to measure the rate of diffusion of these helium gas molecules, which reflect the size of the air sacs in the lung.

联合其他的仪器研究者能够测量出氦气分子的扩散率，这将反映出肺中肺泡的大小。

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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide