英语翻译The Forest Service is responsible for the forests on pub

英语翻译
The Forest Service is responsible for the forests on public land in the US.It supervises almost 78 million hectares of forests,grasslands,rivers and lakes.It's an agency of the Department of Agriculture.Forest Service officials say there are 4 major threats to forests and wild land in America.The first is the threat of fire and fuel.Fires are a natural enemy of forest growth,but they can also threaten lives and property.Fuel is dead plant material and small plants that grow under tall trees.The Forest Service estimates that up to one-fourth of the forests it supervises have dangerous levels of fuel.Sometimes foresters set controlled fires to remove the fuel.Other times the fuel must be cleared by hand.Another threat to forests is from invasive species.These are nonnative plants and animals that push out native kinds.They can cause a lot of economic damage.Some invaders are insects,some are diseases,and other are plants like the fast-growing kudzu vine.The agency says another threat to the health of wild land is the loss of open space.It says over 1 hectare of forest or grassland is lost to development every minute.Development also leads to the division of large natural areas into smaller ones.The fourth threat to public land is what Forest Service calls unmanaged recreation.People can hunt,fish and camp in many national forests.But careless use of motor vehicles and other actions can be destructive.
就这些了,要人工的哦!好的话,

美国国家森林管理局负责管理美国境内的公共森林.它监管大约78,000,000公顷的森林,草地,河流,湖泊,是美国农业部的下辖单位.森林管理局的官员说,目前森林面临着4个主要威胁.第一个是火灾和化石燃料,大火是森林的天敌,同时也可以威胁到人类的生命与财产安全.化石燃料是在高大植物脚下生长的植物死后的产物.据森林管理局估计,大约四分之一的森林化石燃料的含量都处于危险的水平.有时森林管理人员需要主动放适当的火来消除这些死去的植被.其他时候这些死去的植被需要亲自用手清除.威胁森林的第二个因素是外来物种的入侵.这些非本地的植物与动物排挤本地的植物与动物物种,并且能够造成巨大的经济损失.这些入侵物种有些是昆虫,有些是病毒,还有些是植物例如疯长的野葛.第三个因素是森林与绿地空间的缩小.据统计平均每分钟就有多于1公顷的森林或者绿地由于开发的原因被占用.开发同样把大片的森林分割成许多小块.第四个因素被称为不可控因因素.人们可以在国家森林中打猎,宿营,钓鱼.但是由于一些人的疏忽,随便使用汽车等不小心的行为也对森林有不好的影响.