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hows…,…illustrate … (劍五p52,劍四p100劍四p54)for example:(首段)the three lines in the chart each show the changes in the proportion of the elderly people to the population of the usa, sweden and japan from 1940 till today. also the chart gives predicted date for the trends.(主體段)since 1940, the proportion in the usa has been slightly higher than that in sweden at any given time, while that in japan was always the smallest. specially, the figures for the three countries in 1940 were 9%, 7%, 5% respectively. the changes in the proportion in the usa and sweden are featured mainly by steady increase although since 1980 the usa experienced somewhat declines. by contrast, japan did not see increase substantially, sending it to a peak of 5% in 2007, the same as in 1940. according to the prediction since 2000, the upward trends will have been obvious in the three countries, but in japan will soar at the fastest s