translation.en: It's also why in the spring, we have to make a best guess at which three strains are going to prevail the next year, put those into a single vaccine and rush those into production for the fall.
translation.zh: 这也就是，为什么每年春天 我们可以做好的设想一下， 至少三类病毒会在明年流行的原因。 我们把这些病毒制作出一种疫苗， 在秋季加紧投入生产。