儿童的大脑额叶在整个幼儿时期会不断成熟，而这部分大脑对于记忆特定的事件是至关重要的，以后还可以再回忆起这些事件。
Maturation of the frontal lobes of the brain continues throughout early childhood, and this part of the brain may be critical for remembering particular episodes in ways that can be retrieved later.
如某些两栖动物即使在完全成熟并已经度过水中生活的时期后仍然保留有鳃。
For example, certain amphibians retain fishlike gills even when fully mature and past their water-inhabiting period.
这种膨胀正好就是我们的宇宙在大爆炸时期所发生的事情，当时一小块物质膨胀成了现在成熟的宇宙。
Such expansion was precisely what our universe did in the Big Bang, when it suddenly exploded from a tiny clump of matter into a fully-fledged cosmos.
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