57.犯错误　　　 make mistakes

56.被用来学英语 be sued to study English

55.把……比作　 compare… to…

54.科学的暗喻　 scientific metaphors

53.将来　　 in the future

52.快速地　 at such a high space

51.既然　　 now that

50.毕竟，终究　 after all

49.明显不同于　 be clearly different from

48.储存信息　 keep information in its memory