“H7” and “N9” refer to particular types of two proteins, haemagglutinin and neuraminidase, that help influenza viruses invade host cells.

“H7”和“N9”是指两种蛋白质，血凝素和神经氨酸苷酶，这两种成分使得流感病毒侵宿主体细胞。

And type A's can be divided into further sub-categories, depending on the subtypes of two proteins present on their surface: hemagglutinin, 'H', and neuraminidase, 'N'.

A型流感病毒还进一步细分，取决于其表面存在的两种蛋白质的亚型：血凝素(H)和神经氨酸苷酶(N)。

Sold under the names Tamiflu and Rolenza, these drugs have been said to work by blocking the protein neuraminidase that viruses use to escape their host cells.

这些药物 Tamiflu 和 Rolenza 的称出售，据说通过阻断病毒用来逃逸宿主细胞的蛋白质神经氨酸酶起作用。