The incident set off a debate about how public land should be used.这起事件引发了一场有关如何使用公共土地的争论。The enclosure of public land meant that ordinary people couldn't use it.公共土地的圈围意味著普通人将不能使用它。They have promised that the development will not encroach on public land.他们已经承诺这个开发项目不会侵占公共土地。