第一部分描述了大约在公元900年到公元1200年的中世纪温暖期。

Part One describes the Medieval Warm Period, roughly 900 to 1200.

youdao

由于中世纪温暖期的中点约为850年，因此邦德循环的延长将使下一个温暖间隔的中点出现在二十四世纪。

Because the midpoint of the Medieval Warm Period was about 850, an extension of Bond's cycles would place the midpoint of the next warm interval in the twenty-fourth century.

youdao

“现在对中世纪温暖期还不甚明了的是彼时美国西部地区的温暖程度，”史威特南说。

"What's not so well known about the Medieval warm Period is how warm it was in the western U.S.," Swetnam said.

youdao