美术课上,老师叫我们画一画“树上树下”。我好奇地问老师:“什么叫‘树上树下’,怎么画?”老师介绍道:“要画‘树上树下’,先在白纸上画一棵大的树,再画‘顶楼’住着谁,中间又住着谁,最后画‘底楼’住着谁。”老师边说边不由自主地在黑板上画了一棵大树,又在“顶楼”画起了小? Art class, the teacher told us to draw a picture of “trees under the tree.” I was curious to ask the teacher: “What is the tree under the tree?”, How to draw? “The teacher introduced:” To draw the tree under the tree, “first draw a big tree on white paper, 'Who live, who live in the middle, and finally who painted the' ground floor 'live. ”The teacher said involuntarily on the blackboard drew a tree, but also in the“ attic ”painted a small?