The woods are remnants of a huge forest which once covered the whole area.
这片树林只是剩下的一部分，原来这一带是一大片森林。
One third of this area is covered with forest.
这一地区三分之一的地方都是森林。
One third of this area is covered by forest.
这地方三分之一都被森林覆盖。
The woods are remnants of huge forest which once covered the whole area.
这些树木是曾经覆盖着整个地区的茂密的森林所残留的部分。
A quarter of the area is covered with virgin forest.
四分之一的地区都是原始森林。
A quarter of the area is covered with virgin forest.
四分之一的地区都是原始森林。
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