就牛津大学的纳米孔技术而言，DNA分子依靠第二种蛋白质以一次一个碱基的速度通过小孔。这个蛋白质是一种被称为核酸外切酶的酶。

In the case of Oxford Nanopore's technology, the DNA molecule is fed through the hole one base at a time by a second protein, an enzyme called an exonuclease.

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周二，直升飞机带着食品等补给物资来到了受创最重的城镇孔斯蒂图西翁，地震之后的海啸令这里成为一片废墟。

On Tuesday, helicopters arrived with food and other supplies in one of the hardest hit towns, Constitucion, which was swamped with waves after the quake.

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但是，当二氧化碳含量高时，叶孔收缩。

But when carbon dioxide levels are high, the leaf pores shrink.

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