“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，血凝素和神氨酸苷酶，这两种成分使得流感病毒可以入侵宿。

Antibodies for the flu are primarily directed against the two proteins on the surface of the influenza virus, hemagglutinin (H) and neuraminidase (N).

流感抗要针对流感病毒表面的两种蛋白质，血凝素（H）和神氨酸酶（N）。

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型流感病毒还可以进一步分，取决于其表面存在的两种蛋白质的亚型：血凝素(H)和神氨酸苷酶(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.

这些药物以 Tamiflu 和 Rolenza 的名称出售，据说通过阻断病毒用来逃逸宿的蛋白质神氨酸酶起作用。