站在太阳与一棵树之间，把自己头的影子映照在树干上肩膀的影子落在地上。
Stand between a tree and the sun, project the head's shadow on the tree while shoulder's on the ground.
当太阳在天上走过时，棍子的影子与圆圈相交，他便在圆圈上划出许多分割圆圈的记号。
As the sun passed overhead, he marked even divisions on the circle as the shadow of the stick crossed it.
当太阳在天上走过时，棍子的影子与圆圈相交，他便在圆圈上划出许多分割圆圈的记号。
As the sun passed overhead, he marked even divisions on the circle as the shadow of the stick crossed it.
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