To get annual temperatures, they measured rings in high-altitude conifer trees, which grow faster in warmer summers and slower in colder years.
为了得出每年的气温值，他们对生长在高海拔地区的针叶树的年轮进行测量，这种树木在炎烈的夏天生长得比较快，而在寒冷的年份就长得比较慢。
To get annual temperatures, they measured rings in high-altitude conifer trees, which grow faster in warmer summers and slower in colder years.
为了得出每年的气温值，他们对生长在高海拔地区的针叶树的年轮进行测量，这种树木在炎烈的夏天生长得比较快，而在寒冷的年份就长得比较慢。
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