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.
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.
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.
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.
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.
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