1·Under normal conditions, vaccinia spread across one cell every 1.2 hours, which was slowed to one cell every five to six hours.
正常条件下，牛痘病毒每1.2小时传遍一个细胞，而现在减慢至每五六小时传遍一个细胞。
2·Just after vaccinia infects a cell, it expresses two viral proteins on the cell surface, which marks the cell as infected.
牛痘刚感染一个细胞后，就在细胞表面显示出两个病毒蛋白，这表明细胞已经感染。
3·Vaccinia story tells us that the fight against infectious disease needs the concerted efforts of all countries in the world.
牛痘的故事告诉我们，战胜传染病需要世界各国的共同努力。