All the resultant activities have tended, on balance, to reduce tree cover and increase grassland.

总的来说，所有由此产生的活动都趋向于减少树木覆盖，增加草地。

youdao

As much as a third of the total tree cover has been lost since agriculture began some 10,000 years ago.

自从一万年前农业开始发展以来，已有三分之一的树木被砍伐殆尽。

youdao

Tell-tale wisps of grey smoke rise above the tree cover to point the way.

屡屡的灰烟飘荡在上空指向工厂的方向。

youdao

Researchers using satellite images found at least ten percent tree cover on more than one billion hectares of farmland.

VOA: special.2009.09.01

The study found that climate conditions alone could not explain the amount of tree cover in different areas.

VOA: special.2009.09.01

The study found the most tree cover in South America.

VOA: special.2009.09.01

The 510 is suited for the most challenging conditions, such as canyons and adventures with heavy tree cover.

ENGADGET: Edge 510 and 810 cycling computers appear on Garmin's web store (update: hands-on photos)

He says that tree cover is a good first step to keeping cooling costs down in the South.

NPR: North Carolina Family Takes Carbon Challenge

Ancient woodlands are defined as any area which has been under continuous tree cover for at least 400 years.

BBC: Trees being felled in Yorkshire woods