慢速英语:Immigrants Keep U.S. Birth Rates from Dropping(翻译)

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短语讲解：

1. The drop in total fertility rates has been sharp since the economic recession of 2008, according to the U.S. Census Bureau.

according to 根据，按照
例句：Philip stayed at the hotel, according to Mr Hemming
据亨明先生所说，菲利普住在旅馆里。

2. According to the Pew report, 51 percent of foreign-born mothers spent at least 11 years in the United States before having a baby.

at least 至少
例句：He's been away for at least a week.
他走了总有一个星期吧。

3. At the same time, the rate has held steady for U.S.-born women, Pew reported.

at the same time 同时; 一起; 但是
例句：I can' t be in two places at the same time !
我不能同时在两个地方！