They also knew from experiments on pigs, conducted by others, that exposure to one virus during early life has the potential to make infections of other, quite different, viruses later on much more severe than they otherwise would have been. 请问老师much more severe 这句话在句子中做...
A similar pattern is seen in the next to lowest income group,from 3.5 to 3.8 to 4 per 1,000. 请问这里的next to是整体做副词修饰lowest吗?还是next和to之间省略了什么? from 3.5 to 3.8 to 4 per 1,000是pattern的定语吗?
Last month, after analyzing figures on epidemics since 1960, The Economist concluded that people die at a higher rate from such disease outbreaks in authoritarian countries than in democratic ones, even controlling for income levels.请问control for在这里是什么意思?