So, it's awkward to have to wait for a cow to get infected before you can vaccinate a population.
在给人们预防接种之前,你只有干等着,直到有一头奶牛感染了病毒才行
There are a lot of volunteer kind of programs that you can do for a couple of years until you can find a job.
有许多志愿者项目,你可以参与几年,直到你找到工作。
And so you feel helpless until you notice that there is, off to the right, a side track and at the end of that track, there is one worker working on the track.
你极为无助,直到你发现,在轨道的右侧,有一条侧轨,而在侧轨的尽头,只有一名工人在那施工。
You can't have a notion of "raw" until you have the notion of "cooked."
你不可能有“生食“这个概念“,直到你“熟食“这个概念的出现“
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