是可数名词,复数:forests
Parts of the forest are still dense and inaccessible.
森林的一些部分仍然很茂密,人迹罕至。
...25 million hectares of forest.
2,500 万公顷的森林
They descended from the plane into a forest of microphones and cameras.
他们从飞机上走下来,迎接他们的是数不清的麦克风和照相机。