For example, the vaccine has been available to a group of Maasai herders in northern Tanzania for about seven years.
VOA: special.2009.11.03
So, instead, it was amazing he was able to group things in terms of the properties that he saw.
但是,他能够仅仅通过自己知道的那些性质,就能对元素进行归类,这是非常难得的。
They're usually addressed to groups of people, and they deal with sort of philosophical sounding issues, and they give advice on group problems.
通常是写给一群人的,讨论哲学问题,给团体问题提出一些建议。
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