一个胚胎的成长史
发布: 2009-10-03 10:04 | 作者: cnnas | 来源: 大风车中英文门户网站社区
一个胎儿的成长史
由伦纳.尼尔森拍摄的在子宫内发育中的胎儿照片
Photographs of the foetus developing in the womb, by Lennart Nilsson
1965年，当伦纳.尼尔森拍摄的在子宫内发育中的胎儿照片在生活杂志发表的时候，曾引起轰动。在几天之内，8百万份销售一空。40多年后的今天，这些照片的影响力仍不减当年。
When Lennart Nilsson's pictures of developing embryos were published in Life magazine in 1965, they caused a sensation. Within days, the entire print run of eight million had sold out. More than 40 years later, the photographs have lost none of their power
第5个星期的胚胎，大约9毫米长，脸部开始发育，口，鼻孔和眼睛出现。
Five weeks. The embryo is approximately 9mm long. A face develops, with openings for the mouth, the nostrils and eyes
现代先进的科技能让我们获得更加清晰和分辨率更高的图片。这些图片有些是采取了传统相机的宏观镜头，而另一些则使用的内窥镜。扫描电子显微镜技术使尼尔森拍摄的图像能放大数十万倍。
Advanced technology now allows even clearer and more magnified images. Some of these pictures were taken with conventional cameras with macro lenses, while others were taken with the use of an endoscope. Scanning electron microscope technology enabled Nilsson to take pictures at a magnification of hundreds of thousands
第八周，快速生长的胚胎在胎儿囊内被很好的保护起来。
Eight weeks. The rapidly-growing embryo is well protected in the foetal sac
他那些具有里程碑意义的照片被收集在一个精装本里--《孩子出生记》
His remarkable pictures have been collected in a large hardcover book, A Child Is Born, published by Jonathan Cape
十个星期时，眼睑是半关闭的，它们将在数天内完全关闭
10 weeks. The eyelids are semi-shut. They will close completely in a few days
第十六周的胎儿，胎儿利用其手中探索自己的身体及其周围地区
16 weeks. The foetus uses its hands to explore its own body and its surroundings...
..现在的胎儿能够抓住并拉扯长的脐带。这时候，他的骨架主要由松散的骨头连接。透过薄薄的皮肤，可以看到其血管网络。
...The foetus can now grab and pull the long umbilical cord. The skeleton consists mainly of flexible cartridge. A network of blood vessels is visible through the thin skin
胎儿第十八周，大约有14厘米长，这时候的胎儿能感知外界的声响。
18 weeks: Approximately 14cm. The foetus can now perceive sounds from the outside world
第二十周，胎儿体长大约20厘米，胎毛布满整个头部。
20 weeks. Approximately 20cm. Woolly hair, known as lanugo, covers the entire head