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.

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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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