英语翻译
Man has a big brain.he can think,learn and speak.Scientists used to think that men are different from animals because they can think and learn.They know now that animals can learn----dogs,mice,birds can learn.So scientists are beginning to understand that men are different from animals because they can speak.Animals cannot speak.They make noises when they are afraid,or angry,or unhappy.Apes are our nearest cousins.They cannot think like us because they have no language.They can neverthink about the past or the future.Language is a wonderful thing.Every child can speak his own language very well when he is four or five----but no animal learns to speak.How do children learn?Scientists do not really know.What happens when we speak?Scientists do not know.They only know that man can speak because he has a big brain.