根据以下内容回答题：It is difficult to iniagine what life would be like without memory．The meanings of thou-sands of everyday perceptions，the bases for the decisions we make，and the roots of our habits and skiUs are to be found in our past experiences，which are brought into the present by memory． Memory call be defined as the dapacity to keep information available for later use．It includes not only“remembering”things like arithmetic or historical facts，but also involves any change in the way an animal typically behaves．Memory is involved when a rat gives up eating grain because he has sniffed something suspicious in the grain pile．Memory is also involved when a six-year-old child learns to swing a baseball bat． Memory exists not only in humans and animals but also in some physical objects and machines．Computers，for example，contain devices for storing data for later use．It is interesting to compare the memory-storage capacity of a computer with that of a human being．The instant-access memory of a large computer may hold up t0 100 000“words”一ready for instan．t use．An average U．S．teenager probably recognizes the meaning of about l00 000 words of English．However，this is but a fraction of the total amount of information which the teenager has stored．Consider，for example，the number of faces and places that the teenager can recognize on sight．The use of words is the basis of the advanced problem．solving intelligence of human beings．A large part of a person’smemory is in terms of words．and combinations of words.