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补充动词 keep / remain / maintain unchanged / constant / stable fluctuate upward / downward double / triple / quadruple A possible answer: According to the line chart, visits abroad by UK residents increased from about 12 to 57 million from 1979 to 1999. Similarly, overseas travelers to Britain went up from about 10 to 27 million. It is obvious that UK tourists were more and climbed faster than overseas ones during the period. 复杂线图： 极值： 峰值：peak , summit , highest point 谷值：touch the bottom , nadir , lowest point 稳定时期：plateau , lower stationary phase A possible answer: According to the curve chart, daily electricity need is higher in winter than in summer . In winter, electricity consumption peaks at 2:00 am and 10:00 pm while it touches the bottom at 0:00 am and 8:00 am. On the other hand, in summer, it summits at 2:00 pm and 11:00 pm, but has a nadir at 9:00 am and a lower stationary phase from 4:00 pm to 9:00 pm. 简单柱图： A possible answer: The bar graph demonstrates that the most UK visitors went to France and Spain, which were 11.0 and 9.5 million. Also, many British travelers were attracted by the USA , Greece and Turkey . | 
