歌词静态显示如下 歌词滚动显示右下
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| [00:06.24]For years, many scientists have considered walking on two legs as one sign of being human. [00:15.46]Early humans were not thought to have used their knuckle bones or other parts of their hands in walking. [00:23.59]Now, however, American scientists have found evidence that humans developed from creatures that walked on their knuckles, [00:32.71]much like gorillas and chimpanzees do today. [00:36.60]Researchers Brian Richmond and David Strait are from the George Washington University in Washington, D.C. [00:45.84]They say they made their discovery almost by accident during a visit to the Smithsonian Institution in Washington. [00:55.01]They compared old reports about the biology of apes with a copy of the wrist bone from Lucy, [01:02.43]the most famous fossil remains of an early form of human. [01:06.85]Their findings are reported in the publication Nature. [01:11.37]The researchers examined how the wrist structure of chimpanzees and gorillas differs from other apes. [01:20.01]They also examined the wrist bones from Lucy [01:19.01]and another human-like creature that lived in Africa more than 3,000,000 years ago. [01:26.56]The researchers say the ancient creatures had the same wrist structure as modern chimpanzees and gorillas. [01:35.78]They found structures in the wrist bones that restricted the movement of the wrist. [01:41.58]However; the researchers do not believe the creatures used their knuckles in walking [01:48.32]because they had longer legs than the apes. [01:51.80]The researchers say a creature with longer legs would have a difficult time [01:58.28]supporting its weight on its lower legs and hands at the same time. [02:04.05]They suggest that the wrist structure for knuckle-walking may have developed even earlier -- as much as 5,000,000 years ago. [02:14.03]David Strait says the development of walking upright required major changes in the structure of the early human ancestors. |
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