双语例句原声例句
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要花好几十年的时间来逐步达到所需要的教育和发展水平。
It would take many decades to build up the level of education and sophistication required.
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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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