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.
由美国林业局确定的游憩机会谱理论（ROS）被证明是一种最有效的游憩资源规划管理工具，已广泛运用于美国的公共游憩地。
ROS was proved to be the most effective tools about recreational resources planning and management by American Forestry Bureau, which has been widely used in the United states.
由美国林业局确定的游憩机会谱理论（ROS）被证明是一种最有效的游憩资源规划管理工具，已广泛运用于美国的公共游憩地。
ROS was proved to be the most effective tools about recreational resources planning and management by American Forestry Bureau, which has been widely used in the United states.
应用推荐