图表种类 柱状图 图表instruction The bar chart shows the average number of pupils in primary and lower secondary schools in six countries in 2006. Summarize the information by selecting and reporting the main features, and make comparisons where relevant. 图表要素回忆 柱状图，比较6个国家的小学和初中生平均人数；信息量不大且是静态的条形图