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一“活动过程活动!#植物与数学$多媒体展示%许多蔓生植物的枝藤细弱自己无法向空中生长因此常常需要缠绕在其他粗壮的植物主干上向上爬形成一条近似的圆柱螺旋线!如喇叭花”牵牛花的藤的生长情况!
An activity process activity! # Plants and Mathematics $ Multimedia Display % Many creeping plants have weak twigs that cannot grow in the air and therefore often need to be wound up on the trunk of other sturdy plants to form an approximately cylindrical spiral! "The growth of the morning glory’s vine!