它本身就是奇异的进化事件的遗迹(古代细菌和细胞—所有动植物的祖先细胞——的融合体)，同时，它还带着比较近期进化的印记。
Itself the remnant of a strange evolutionary event (the merger of an ancient bacterium with the cell ancestral to all plant and animal life), it also carries the imprint of more recent evolution.
我们祖先所做的是在我们的皮肤细胞中产生更持久的天然色素。
What we did in our ancestry was to produce more permanent natural coloring in our skin cells.
“巴基鲸”化石由一个原细胞的完整头盖骨所组成，这是现代鲸类祖先中已经灭绝的一个物种。
The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans.
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