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.
“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.
届时，里奥·费迪南将作为队长登场，利物浦中场史蒂文·杰拉德将担任副队。
They will be lead out in that match by Ferdinand, with Liverpool midfielder Steven Gerrard moving to vice-captain.
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