两个小通道上面分别写着分子通道和缩小通道。

Two small channels above writing respectively molecules and narrow channels.

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现在我们获得了第一个离子通道的分子结构，提供了对三维结构离子通道孔的了解。

We now have obtained the first molecular structure of an ion channel, providing us with a three-dimensional understanding of the ion channel pore.

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离子通道是一种分子，它允许钠、钾、钙等离子经由它通过细胞外膜。

An ion channel is a molecule that allows the passage of electrically charged atoms of sodium, potassium, calcium and so on through the outer membrane of a cell.

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Now, these are special channels in that they only allow certain molecules to pass through.

这种特殊的通道,只能允许特定的分子通过

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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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