a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar
a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox
造句
用作名詞(n.)
Since vaccinia may cure smallpox, then monkey? 牛痘既然可以治愈天花，那麼猴子呢？
However, a virus called vaccinia spreads four times faster than what was thought possible. 然而，一種名為牛痘的病毒傳播的速度比我們所能想像的快四倍。