The water in it is just right at the level of the Gaiwan's mouth, with a simple drop on the desk,

里面的水正好和盖碗的嘴一样高，只有一两滴落在在桌子上。

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And because glucose fuels the neurons, a transitory low level in the brain may signal the stomach to get the hands to fill up the mouth, even though the energy actually spent has gone up just a hair.

因为葡萄糖是神经元活动的能量来源，所以大脑中的短暂的葡萄糖低浓度水平会向胃发出信号，让人赶快往嘴里塞食物，纵然能量其实只消耗了九牛一毛。

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The citric acid in the juice alters the pH level in your mouth, killing the bacteria that cause bad breath.

果汁中的柠檬酸会调节口腔的PH值，杀死造成口气的细菌。

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"By that I mean try to imagine creating a cavity inside your mouth without any air bubbles and by letting in no air through your lips or throat -- it's basically impossible at sea level because the air pressure outside your mouth pushes the air pocket closed, " he said.

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