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这是一个星期天,丁丁和爸爸妈妈一起出游,来到了最近新修的大坝上。大坝是用石头堆积而成的,外面用水泥和沙子抹平,上面是公路。丁丁走在高高的大坝上,一侧是清澈的河水,一侧是绿油油的庄稼,一眼望不到边。微风吹来,夹杂着花香,大自然给人的感觉真好呀!这时爸爸指着大坝问丁丁,这个大坝的横切面是个什么图形呢?丁丁随口说道,不是平行四边形吗?爸爸耐心地指着大坝左右两边的斜坡说,这两个边相互平行吗?丁丁边看边思考,最后,坚定地说道,这个大坝的切面应是一个梯形,这一次没有错吧?爸爸微笑着点了点头。
This is a Sunday, Tintin and Mom and Dad travel together, came to the recently renovated dam. The dam is piled with stones, covered with cement and sand outside, above the road. Tintin walk in the high dam, one side is the clear river, one side is green crops, at a glance the edge. Breeze blowing, mixed with flowers, nature gives the feeling of good ah! Then dad pointing the dam asked Tintin, the cross-section of the dam is what kind of graphic it? Tintin casually said, not a parallelogram? Dad patience Pointing to the slopes on the left and right of the dam, said the two sides are parallel to each other? Tintin looked at thinking, and finally, firmly said that the dams should be a trapezoidal section, this time is not wrong, my father smiled Nodded.