by Birth Year的意思|示意

Thus the gap continues to widen between rich and poor, and by the year 2000 at least 45 countries are expected to have a life expectancy at birth of under 60 years.

因此，富国和穷国之间差距在继续扩大，在2000年至少有45个国家人口的平均寿命低于60岁。

The ratio of cesarean section birth to dystocia delivery increased year by year, with reverse trend of forceps delivery.

剖宫产占难产分娩的比例逐年增高，同期产钳助产占难产分娩的比例逐年下降；

A 66-year-old Romanian woman gave birth to a baby girl on January 16 and was claimed by Romanian media to be the world's oldest mother ever.

1月16日，罗马尼亚一名66岁的妇女产下一女婴。当地媒体称她为世界上年龄最大的产妇。

In five countries life expectancy at birth is expected to decrease by the year 2000, whereas everywhere else it is increasing.

有5个国家出生时平均预期寿命将下降到2000年水平，而其他地方却在逐渐的提高。

Each year between 50 000 to 100 000 women worldwide are affected by obstetric fistula, a hole in the birth canal.

全世界每年有5万至10万名妇女罹患产科瘘，即产道出现瘘孔。

The average birth weight was increasing year by year.

平均出生体重呈逐年递增趋势。