the teen birth rate 美国青少年生育率
The CDC study did not explore why the teen birth rate is at an all-time low.
疾病控制中心的研究并没有探究出为什么青少年出生率总是处于低比率状态。
The teen birth rate in the United States reached an all-time low last year, the Centers for Disease Control and Prevention reported on Thursday.
美国疾病控制和预防中心在周四报道，去年以来美国的出生率达到了又是以来的最低点。
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