Man has a big brain .He can think ,learn and s

Man has a big brain .He can think ,learn and s
Man has a big brain .He can think ,learn and speak.Scientists once thought thant men are different from animals because they can think and learn.Now they know that dogs,cats and birds can learn,too.So they think that men are different from animals because they can speak.While animals can't .Animals make noises when they are atraid,or unhappy .Apes can even under stand some things more quickly than men.One or two of them have learned a few words.But they cannt join words to make sentences.They cannot think like us because they have no language.Language is a wonderful thing.With its help,men can make anything even our modern world.Every child can sp his own language very well when he is four or five,but no animal learns to speak.How does a child learn it Scientists do not really know.They only know that man can speak because he has a brain .这篇文章怎么翻译?