We have to change the approach if things aren't working but we have to keep after it.
必须改变现有的方式,不论是否会有成果。
It is important to keep going after you finish this course.
在完成这一课程后,进一步的学习非常重要。
Whether we make mistakes or not, we got to keep after it.
不论会不会犯错,我们都必须支持。
To keep that conception in regard to decent race relations alive and growing has been the aspiration of generation after generation in many an American family, judging by my own and by those I know.
美国世世代代,都憧憬这一种理想,那就是保持,广博开放的胸襟,来正确面对种族问题。
So you need hundreds of millions of doses, at least, and you need a way to distribute that around the world, and you need a way to keep track of who got sick and who didn't after they got vaccinated.
至少需要上亿支的剂量,还得有办法将疫苗运送到世界各地,你还要一种方法进行跟踪,在接种疫苗之后谁得病了和谁没得病
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