translation.en: There's one estimate which suggests that in the United States, two thirds of the land which was once forested and then cleared has become reforested as loggers and farmers have retreated, particularly from the eastern half of the country.
translation.zh: 有一项研究估计，在美国 原本森林被砍伐的土地中，有三分之二 已经重新造林，伐木工人和农民离开了 这样的现象尤其在美国东部较为常见