当我们观察一棵树的生命时，我们了解到生命的每一个阶段都有它自己的欢乐和挑战。

When we are looking at the life of a tree, we learn about that each period of life brings its own form of joy and challenge.

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类群之间的差异和每个类群内部的相似性使大多数生物学家确信，生命之树只有两个树干。

The differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems.

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这个数字是通过研究“生命谱系树”的“分枝”和“树叶”的关系得出的。

The number comes from studying relationships between the branches and leaves of the "family tree of life".

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Second of all the motif of guards who block access to the tree of life suggests that no humans have access to immortality and the pursuit of immortality is futile.

第二点，那些阻止人类接近生命树的守卫,暗示着，任何人类关于永生的尝试,最后都是徒劳一场。

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And what precisely are these cherubim that are stationed in front of the tree of life barring access?

这些守护生命树的天使,到底是什么东西？

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Once they discovered their moral freedom, once they discovered that they could thwart God and work evil in the world, and abuse and corrupt all that God had created, then God could not afford to allow them access to the tree of life.

一旦他们意识到了，道德自由,一旦他们违背上帝，开始作恶,摧残，腐化，上帝的创造物,上帝便不准他们再接近生命树。

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