The H and N refer to two glycoproteins that coat the surface of the virus: H stands for hemagglutinin, which allows the virus to invade human cells, while N (neuraminidase) is a special protein that stops adsorption after the virus replicates, facilitating the spread of the virus and allowing it to infect more cells.
「H」是病毒藉以吸附人類細胞及侵入細胞的「血球凝集素」，「N」（神經胺酸酶）則是病毒複製以後，用以切斷吸附，以便散播病毒、感染更多細胞的一種特殊蛋白。