birthrate是什么意思
音标:英 [‘bɜ:θˌreɪt]美 [‘bɜ:θˌreɪt]
出生率
the ratio of live births in an area to the population of that area; expressed per 1000 population per year
birthrate的用法和例句：
1.
As birthrates fell, they made things worse.
出生率下降 他们却火上浇油
