The sex ratio of 15-year-olds in 2005 was not far from the sex ratio at birth in 1990.
2005年统计的15岁人口的性别比例与1990年的出生时统计的性别比相差不大。
Still, it is significant the sex ratio at birth is improving, not worsening.
尽管那样,出生时的比例在好转而不是在恶化,这是很具意义的。
In many provinces, the sex ratio at birth is between 120 to 130 boys for every 100 girls; the natural number is about 10
在许多省份,男女出生比例为120到130个男孩比100个女孩,而自然的数字大约是104。