sex ratio at birth
常见例句
- India does, in fact, publish data (since 1999) on the sex ratio at birth.
ECONOMIST: Letters - The sex ratio of 15-year-olds in 2005 was not far from the sex ratio at birth in 1990.
ECONOMIST: Gendercide - Still, it is significant the sex ratio at birth is improving, not worsening.
ECONOMIST: India's skewed sex ratio: Seven brothers The 返回 sex ratio at birth