几年前，美国林业局在芝加哥研究树木。
A few years ago, the US Forest Service studied trees in Chicago.
美国林业局的朱棣说，消防官兵正全力以赴，以阻止森林大火向山顶蔓延。
Nathan Judy of the U. S. Forest Service says firefighters are trying to keep the flames from reaching the summit.
在缅因州，美国林业局的丹尼尔·詹宁斯征募蜘蛛来与云杉芽卷蛾——东北部云杉和冷杉林最凶恶的敌人——作战。
In Maine Daniel Jennings of the u. s. forest service has enlisted spiders in the war against the spruce budworm the northeast's most devastating enemy of spruce and fir forests.
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