And, in fact, you should stop noticing it after it's been in the environment for long enough.
事实上,如果它在环境中出现的时间足够长久的话,你就不该再去一直注意它了。
Now, I could go on right the way through here, but I'm going to stop because it gets to be a bit boring after a while.
我可以就这样一直算下去,但是还是到此为止吧,因为再这样下去会很无聊
I'm going to stop there and we'll pick up on this topic, not next week, but the week after when we start talking about cell structure.
今天就到这里,我们会继续这个话题的,不是下周,而是在我们开始,讨论细胞结构之后的那个星期
And then after a while they stop.
之后一会儿就都停止了。
Well, it also illustrates that one of the things you do after you introduce a vaccine, you can't stop there, you have to continually watch what's happening with this disease in your population.
同时,也告诉我们,将疫苗推向公众后,你不能就此放手,你必须得继续观察,接种过疫苗的人中,该疾病的发病情况
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