Peter had a hard time with his goats that day, for they would not follow him.
那天彼得和他的山羊闹得很不愉快,因为它们不肯跟着他。
By this time, Jackson had decided that Van Buren would be the best man to follow him as president.
VOA: special.2009.01.01
A cohort study means you take the same group of people and follow them every five years for that period of time.
定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据
That's why every-- development of every specific vaccine turns out to be different because they don't all follow exactly this kind of time course.
这就是为什么,每一种疫苗的发展都是不同的,因为疫苗诱导产生应答所需时间各不相同
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