在过去的一部分时间里，人们没有温度计测温，那些研究过程就使用具代表性的数据，比如树木的年轮来衡量。
For parts of the past where there were no thermometers to consult, such studies use proxy data, such as tree rings.
来自瑞士联邦学院的UlfBuentgen教授和他的研究队伍从中世纪古堡和罗马城废墟中搜寻古代的木头，企图收集关于树木年轮的信息。
Ulf Buentgen and his team of researchers at the Swiss Federal Institute for Forest, Snow and Landscape Research collected tree-ring data from ancient wood found in medieval castles and Roman ruins.
史威特南说，为了获取巨木林中树木的年轮样本，研究人员被允许可以收集倒下树木或枯立木的横截面。
To gather samples from the Giant Forest trees, the researchers were allowed to collect cross-sections of downed logs and standing dead trees, he said.
为了对年轮进行研究，研究人员通常会从树木取出一块铅笔大小的核心部分。
To study tree rings, researchers generally take a pencil-sized core from a tree.
Dendro - climatologist -利用树木年轮来研究气候记录的研究学家。
Dendro-climatologist a researcher who USES tree rings to study the climate record.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
So it is very important to find out the variation regulation of wood ring density in growth process.
由于树木年轮具有定年准确、连续性好、分辨率高、对环境变化敏感性强等优势，已在全球气候变化研究中被广泛应用。
The tree ring has been used widely in the field of global climate change due to its advantage of accurate for cross-dating, well continuity, high-resolution and high sensitivity to the environment.
由于树木年轮具有定年准确、连续性好、分辨率高、对环境变化敏感性强等优势，已在全球气候变化研究中被广泛应用。
The tree ring has been used widely in the field of global climate change due to its advantage of accurate for cross-dating, well continuity, high-resolution and high sensitivity to the environment.
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