撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。
Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.
一百万年前，我们基本上是濒临灭绝的物种。
A million years ago, we were essentially an endangered species.
它的视网膜上每平方毫米有一百万个视锥细胞，所以它能分辨出很细微的视觉差别。
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina.
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