1.keen to 热衷于

例句:He is keen to have a look at the Great Wall.
他很想去看看长城。 

2.as well as 和...一样

例句:Let' s share in our troubles as well as in our joys.
让我们同甘共苦吧。 

3.birth rates 出生率
 

例句:Out-of-wedlock Birth rates have plateaued for Blacks.
黑人的未婚生育率已经不再增加。

4.free up 空出；释放

例句:Free up time to do what you love most!
挤出些时间做你最想做的事！