Methods: The incidence rates of early reproduction inability of chromosome heteromorphism group and normal karyotype group were compared by using G, C-banded chromosome karyotype analysis.

方法：采用G、C显带染色体核型分析等方法，比较染色体异态核型人群和正常核型人群的早期生殖障碍的发生率。

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Early 20th-century European painters wanted viewers to recognize that they were looking at lines and color on a canvas rather than at a reproduction of the natural world.

20世纪初的欧洲画家希望赏画人注意画布上的线条与色彩，而不是将作品视为对自然实物的复制。

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This may have theoretical significance to the study of the regulation of early embryo development and may also have practical value to reproduction medicine.

此方法对胚胎早期发育规律的研究有理论意义，并可对生殖医学具有重要的应用价值。

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This amazing series of 190 million year old nests gives us the first detailed look at dinosaur reproduction early in their evolutionary history, and documents the antiquity of nesting strategies that are only known much later in the dinosaur record.

FORBES: Paleontologists Find Oldest Dinosaur Nesting Site

In particular the group is concerned that children will not be taught about sexual reproduction and puberty early enough - and that some will already be experiencing changes in their bodies before they have been taught about them.

BBC: Curriculum plan 'waters down sex education' experts warn

Decor is faithful to the early 20th-century colonial aesthetic, complete with restored fireplaces and, in the bathrooms, late Victorian reproduction fixtures.

WSJ: Stays: A Boutique Hotel That Once Held Pirates