That's the focus of our attention in Genesis, and it's only at the end of the story that the tree of life appears again in the passage that is emphasizing its permanent inaccessibility.

这点，是我们读《创世纪》时，应该特别注意的一点,直到故事的结束，生命树才又出现,是为了强调人类，永远无法接近它。

耶鲁公开课 - 旧约导论课程节选