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

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