图表种类 Line Graph 图表instruction The line graph shows the change of average time spent on constructing a car in four different automobile factories between 1998 and 2005.Summarize the information by selecting and reporting the main features, and make comparisons where relevant. 图表要素回忆关于Toyota, Honda等四家汽车生产商从1998到2005年生产一辆汽车所要花费的时间变化。