sex ratio at birth是什么意思 sex ratio at birth怎么读
sex ratio at birth的用法和样例
- Remarkably high sex ratios at birth have been observed recently in Asian populations.
高出生性别比常常发生在亚洲的人口中。 - What happens to the sex ratio at birth if fertility is maintained at a low level depends on the evolution of son preference.
如果生育率维持在低水平上，出生性别比的前景取决于男孩偏好的演化。
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