但当一个人狂饮暴饮大量不含额外电解质的水，细胞的组织系统对被稀释了的钠就素手无措了。
But when a person drinks in large quantities and fast and the water consumed does not contain extra electrolytes, the cell maintenance system can not handle the level of sodium dilution that occurs.
有一个好例子是眼睛中的盲点——视网膜中不含感光细胞的点。
One well-known example of this is the blind spot in the eye, which is a point in the retina which contains no sensory cells.
科学家们曾认为昼夜节律的调节是受基因活动支配，但海藻和红细胞中都不含DNA。
Scientists had previously thought the circadian clock was driven by gene activity, but both the algae and the red blood cells kept time without it.
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