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(单词翻译:双击或拖选)
探索世界奥秘之Life Story(生命物语) Unit9
Millions of years ago, the embryo1 of a distant ancestor of ours would have shared with us many of these features. As well as giving rise to us, it gave rise to all sorts of other creatures. And in those creatures, these features we're looking at here have evolved quite differently. We can actually see it happening with the ear bones, because those very same grooves2 that in us would have become our ear bones, in this creature become something else entirely3. This is the embryo of a fish. Here is its heart. And it too has a curved spine4 and the tiny grooves here, just a fraction of a millimeter long, have evolved to become not ear bones, but supports for its gills.
So, sometime long, long ago, this sort and I shared a common ancestor. And like them it too had little bones around its gills which helped it to breathe. But as we evolved, these little bones were adapted for an entirely different job purpose to become the intricate mechanism5 of our ears.
And our ear bones are not the only things to have been transformed in this way. Such apparent miracles are in fact all around us. The rest of our ears that allow us to balance and walk upright as well as hear, our limbs and hands, our whole body has been shaped by the process of evolution.
Everything about the human body has been inherited and adapted from something our ancestors had a long time ago. Even though they may have used it for something entirely different, we are recycled from the past.
Once we begin to understand the source from which our bodies are derived6, the way we look at ourselves can never be quite the same again. So every part of the human body bears a shadow from our distant past. Evolution has adapted our bodies from those of our ancestors, all the way back since life was as simple as that in the steaming pools of three billion years ago. It is incredible...
words and expressions
derive:To issue from a source; originate.起源于,来自
1 embryo | |
n.胚胎,萌芽的事物 | |
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2 grooves | |
n.沟( groove的名词复数 );槽;老一套;(某种)音乐节奏v.沟( groove的第三人称单数 );槽;老一套;(某种)音乐节奏 | |
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3 entirely | |
ad.全部地,完整地;完全地,彻底地 | |
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4 spine | |
n.脊柱,脊椎;(动植物的)刺;书脊 | |
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5 mechanism | |
n.机械装置;机构,结构 | |
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6 derived | |
vi.起源;由来;衍生;导出v.得到( derive的过去式和过去分词 );(从…中)得到获得;源于;(从…中)提取 | |
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