There are three types of seasonal influenza – A, B and C. Type A influenza viruses are further typed into subtypes according to different kinds and combinations of virus surface proteins.
有三种类型的季节性流感——甲型、乙型和丙型。 根据病毒表面蛋白不同的种类和结合情况，甲型流感病毒又进一步分类为亚型。
Well, in fact, I could use any curve drawn on the level of w equals c So, I could move, really,any way I wanted on that surface.
事实上，可以使用等值面W=c上的任何曲线,可以以任何方式在等值面上移动。
So, then I can choose my favorite surface bounded by C.
那么我可以选择一个被C界定的曲面。
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