在这个充满安全、甚至纯洁的世界，吸血鬼故事，《通道》一书的作者——贾斯汀·克罗宁(Justin Cronin)，正在积聚我们对这种嗜血狂魔的恐惧。

In a world riddled with safe, even chaste, vampire stories, author Justin Cronin's The Passage is restoring our fears of bloodsuckers.

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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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不过，考虑到现在我们的信息通道已经变得相当分散，我对这种做法没有多少信心。

But I find it hard to place much faith in that approach given how fragmented our information channels have become.

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And all ion channels are selective for a single type of ion, and we can think about how that selectivity takes place, and that's where this idea of atomic radius is going to become very important.

所有的离子通道都是仅对某一种离子具有选择性的，而我们可以来想一想这种选择性是如何发生的，这也就是原子半径这个概念将会变得，非常重要的地方。

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