The American Academy of Family Physicians says most children stop sucking their thumb by the age of four.

VOA: special.2009.03.11

This is Frost in old age, as an American bard from a magazine.

这张是他年老时，一个杂志上的吟游诗人。

耶鲁公开课 - 现代诗歌课程节选

In American law, you cannot terminate an employee, for the sole purpose of age.

美国法律规定，如果你仅因为年龄原因辞退员工，

退休很神奇 - SpeakingMax英语口语达人

American medical officials have advised that the treatment,called Gardasil, be given to girls around age eleven.

VOA: special.2009.04.01

They had very similar political ideologies, borne of the republicanism, they all kind of breathed in- that was breathed into them, and they inherited from the age of the American Revolution.

他们有着相似的政治理念,即共和主义,它仿佛注入了他们的思想,因为这是美国独立战争时代留下的遗产

耶鲁公开课 - 美国内战与重建课程节选

For decades,American women were urged to get yearly mammograms, starting at age 40, as part of screening for breast cancer.

VOA: standard.2009.12.25

Georgia native Johnny Mercer, who died in 1976 at the age of 66, crafted one of the most enduring chapters of the "Great American Songbook."

VOA: standard.2010.04.12

The president took his campaign for health care reform to the headquarters of the American Association of Retired Persons, a powerful organization representing the interests of Americans over the age of 50.

VOA: standard.2009.07.28

"It is an age-old problem in politics, where in general in American politics, the candidate who appeals most to the most fervent members of the party wins the primary and then often has a very difficult time appealing to the broader electorate."

VOA: standard.2010.05.19

Richard Milner is working on his next book,which explores the art of Charles R.Knight, the American painter of dinosaurs, ice age mammoths and saber-toothed cats, whose work adorns the walls of the American Museum of Natural History in New York, the Field Museum in Chicago and other institutions.

VOA: standard.2009.11.25