The letter was written by Darwin to thank an American geologist, Dr. Ferdinand Vandeveer Hayden.

这封信是达尔文为感谢美国地质学家费迪南德·范德维耶·海登博士而写的。

youdao

Hayden sighed and stopped counting.

海登长吸了一口气，停止数数。

youdao

Hayden patted his bag. "Of course it is."

海登拍着他的包，胸有成竹地说：“当然啰！”

youdao

Joplin moved to Saint Louis with a woman named Belle Hayden.

VOA: special.2010.01.24

Among them was Retired Air Force General Michael Hayden, who held the post from 2006 until early this year.

VOA: standard.2009.04.20

Communications equipment, armor, night vision goggles, and vehicles are among items being discussed, Hayden said.

CNN: All options on the table regarding Syria, US officials

With Adam Gilchrist and Matty Hayden well set, de Silva was roughly treated on this occasion.

BBC: De Silva still hitting the mark

Michael Hayden, principal deputy director of national intelligence, calls "hot pursuit" of al Qaeda conversations.

CENTERFORSECURITYPOLICY: Our right to security