He hoped he had made the country understand one thing: the great need to forget hatred and bitterness in the difficult time of re-building that would follow the war.
VOA: special.2009.12.31
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
But some employers frown on workers taking time away from their jobs to follow the games and keep track of their brackets.
VOA: standard.2009.03.25
"Even as the economy grows, it takes time for jobs to follow,"
VOA: standard.2009.12.06
Martin Banks, a professor of optometry at Berkeley, says 3-D doesn't allow our eyes to follow the rules because we're focusing on things both far and near at the same time.
VOA: standard.2010.02.21
应用推荐