Still, after years of fights over logging practices, including lawsuits to reduce clear cutting on federal land, distrust of the Forest Service's motives remains.

经过数年与砍伐行为的斗争，其中包括对联邦土地上滥砍滥伐的诉讼，人们对于林务局的动机仍然持怀疑态度。

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The scientists, led by Ulf Buntgen of the Swiss Federal Research Institute for Forest, Snow and Landscape, studied tree samples from Germany, France, Italy and Austria.

瑞士国家森林、雪和景观研究所的乌尔夫邦特，他带领的科学团队研究了德国、法国、意大利和奥地利的树木样本。

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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.

来自瑞士联邦学院的Ulf Buentgen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。

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In one instance, the Sierra Club took the federal Forest Service to court over the management of two forests in Wisconsin.

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In the 1990s, environmentalists and federal forest officials reported forests had become overgrown as a result of firefighters putting out too many natural fires too quickly.

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Many of Mr Murkowski's own proposals for boosting the state economy, such as a plan to increase logging in the Tongass National Forest, require the federal Forest Service to spend millions building new roads.

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