蕨类植物已经从它的林地据点向外蔓延了几个世纪，但是最近在整个英国北部和西部，蕨类植物侵入开阔乡村的速度却惊人地增长。
Bracken fern has been spreading from its woodland strongholds for centuries, but the rate of encroachment into open countryside has lately increased alarmingly throughout northern and western Britain.
这大多发生在更加富裕的地方，例如北美和欧洲。这些地方由于乡村人口不断减少，因此林地不再面临压力。
This was mostly in richer places, such as North America and in Europe, where dwindling rural populations have taken the pressure off forestland.
夏天，在亚极地针叶林地带的沼泽遍布的原野或乡村，出行亦将变得缓慢而艰难。
Summer travel in the boggy lands, or muskeg country, of the Subarctic's taiga was also slow and arduous.
应用推荐