Lin: I feel a lot of challenges, very pleasant surprise.
林依晨:就觉得是一次很大的挑战,也很惊喜。
Every day we face a lot of challenges and choices in life.
每天我们都面对生活中大量的挑战和选择。
Ariel Lin: I feel a lot of challenges, very pleasant surprise.
林依晨:就觉得是一次很大的挑战,也很惊喜。
It has been a good experience, tough though, a lot of challenges, but I am still getting through.
VOA: standard.2009.10.12
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
"One of the challenges we have is to make the Web a lot easier to use even on the simplest and least expensive mobile phones."
VOA: special.2010.11.08
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