1·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。
2·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。
3·Over half of teen pregnancies end with the birth of the baby.
超过一半的怀孕少女会将婴孩生下。
4·Explain to your teen that the doctor will review her medical history, conduct a pelvic exam, and go over the risks and benefits of different types of birth control.
告诉孩子们医生要看过他们的病历，给他们做一个骨盆检查，解释各种避孕药物的利弊作用。
5·Ortega was like many young Latinas in San Bernardino, a sprawling city of 200, 000. They have the highest teen pregnancy and birth rates of any racial or ethnic group.
在圣贝纳迪诺蔓延的城市的有着20万庞大队伍年轻的拉丁裔，最高的青少年怀孕率和最高的任何种族或人种的出生率的群体，而且奥尔特加也是他们中的一员。