叶子似乎被保留在湖底的沉积物里及类似地区。
Leaves tend to be preserved in the deposits laid down in lakes and the like.
然而，如果生命一旦在地表出现，他很有可能留下化石记录。这个记录可能是古沉积物形式保留在地表。
However, if life once existed in surface environments, it is likely to have left behind a fossil record in ancient sediments now exposed at the surface.
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