这种膜上的蛋白通道，直径只有几个纳米，可以（也只可以）让水分子通过，其通道每秒可过滤10亿个水分子。

The membrane’s protein channels, each just a few nanometers across, allow a stream of water molecules—and only water molecules—to pass single file at a rate of one billion per second.

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本文概述了水通道蛋白的发现和其对水分子的筛选传输机理。

This review summarizes the discovery of water channel proteins and their mechanism of water-specific transport.

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结果表明，贫碱型水热法合成红色绿柱石中型和型通道水分子并存，但以型通道水分子的丰度明显占优。

The results show that type I and type II channel water molecules coexist in alkaline poor synthetic red beryl though the abundance of type I channel water molecule is distinctively dominant.

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And that's all that's big enough to pass through or small enough to pass through. And if we go up even just one row on the periodic table to potassium, what we actually see is now that it's going to be too large, and, in fact, a potassium solvated with one water molecule won't go through our channel.

就是这样刚好大到它通过,或者说刚好小到它通过,即使我们再沿着周期表往下走仅仅一行到钾离子，我们看到的就将是它的个头太大了，实际上，溶解于一个水分子的单个钾离子,不能穿过我们的通道。

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