There, I found open ground without trees.

那儿，我发现一片没有树木的开阔地。

youdao

I'm not accustomed to running in the open without trees. And the oxygen deprivation kicks my butt.

我还是不太习惯在没有树的旷野中跑步，稀薄的氧气著实让我吃尽苦头。

youdao

youdao

Without trees, settlers had no wood to build houses.

VOA: special.2010.04.15

Miami recently found that its electricity bills were 10 percent lower in areas with more than 20 percent tree cover compared to those areas without any trees, the New Scientist reports.

CNN: All About: Cities and energy consumption

Did somebody declare war on trees without telling me?

NEWYORKER: Good Neighbors

He knows that big companies will probably never want to make GM versions of a minor crop like walnuts, but he bemoans the fact that protecting his trees without pesticides is expensive (he uses pheromones to lure the insects into mating with everything but one another).

FORBES: Green Genes