原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
该句暂无译文！
2 .Historical instances of dramatic societal upheaval have been attributed to changes in climate.
该句暂无译文！
3 .Now a cave in China has been shown to contain both physical evidence for specific periods of drought and written records of the hardships, in the form of graffiti by people suffering from those droughts.
该句暂无译文！
4 .The findings are in the journal Scientific Reports.
该句暂无译文！
5 .During the past 500 years, people made regular pilgrimages to the Dayu Cave in the Qinling Mountains of central China.
该句暂无译文！
6 .During seven of the visits, the oldest one going back to the year 1520, pilgrims left messages on the cave walls related to droughts.
该句暂无译文！
7 .Researchers were able to link those graffiti, which contain dates, to physical evidence of the water shortages.
该句暂无译文！
8 .For example, lack of water caused changes in ratios of stable isotopes in specific layers of cave formations, such as stalagmites.
该句暂无译文！
9 .The site has thus provided the first known case of historical and geological records existing in the same cave.
该句暂无译文！
10 .Cambridge University earth scientist Sebastian Breitenbach is a co-author of the study.
该句暂无译文！
11 .He says that records found in caves and lakes in the last decade reveal possible links between climate change and the downfall of several Chinese dynasties, including the Tang and Ming.
该句暂无译文！
12 .He also notes, "Things in the world are different from when these cave inscriptions were written,
该句暂无译文！
13 .but we're still vulnerable to these events, especially in the developing world."
该句暂无译文！
14 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
该句暂无译文！