It's an image of ascent toward heaven, from which the boy returns.

这是接近天堂的的样子，从那里，这个孩子又回到地面。

耶鲁公开课 - 现代诗歌课程节选

The hymn doesn't anywhere refer to people crossing over on dry land.

在赞美诗中并没有提到人们从地面上穿过海洋。

耶鲁公开课 - 旧约导论课程节选

Here it meant particle that was released from the ground earlier.

这里我说的是先前从地面释放的质点

耶鲁公开课 - 基础物理课程节选