Sweep the leg, do you have a problem with that?
扫堂腿!有什么问题么?
It's a problem all of us face: you have limited time with the person that you want to talk and you want to make this talk memorable.
这是我们所有人都面临的一个问题:你与你想谈的人的时间有限,但你想让这次谈话令人难忘。
There are some states and other countries that have outlawed bisphenol A. the problem, of course, is that you end up with this patchwork of regulations and no consistency or guarantee.
一些州和其他一些国家已经禁止了双酚a。可问题是,这仅仅以一些零零碎碎的法规而告终,这些法规没有连贯性,也没有任何保证。
Now, the problem, or one of the challenges with clinical trials of vaccines is that you have to enroll a lot of patients into clinical trials because only a few are going to get sick in any case, only 20 out of 100,000.
现在的问题是,这也是疫苗临床试验的挑战之一,临床试验必须包括足够多的病人,毕竟只有一小部分人会被传染,十万人里面只有二十人被传染
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