What they found,in attempting to model thought,is that the human brain’s roughly one hundred billion

What they found,in attempting to model thought,is that the human brain’s roughly one hundred billion

题目
What they found,in attempting to model thought,is that the human brain’s roughly one hundred billion nerve cells are much more talented -- and human perception far more complicated -- than previously imagined.
之中的破折号有什么用?有没有其他的表达形式
答案
我认为第一个破折号表示解释,第二个表示加强语气的作用.如果不用就达不到作者要表达的效果.
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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