The reason why we have to grow trees is that they can provideus with fresh air.

我们必须种树的原因是它们能供应我们新鲜的空气。

youdao

The reason why we have to grow trees is that they can provide us with fresh air./ The reason why we have to grow trees is that they can supply fresh air for us。

我们必须种树的原因是它们能供应我们新鲜的空气。

youdao

Though it is di? Cult to grow trees in the saline-alkali soil, the ground cover and wetland vegetation are rich and vary in response to subtle changes in the water table and PH values.

尽管难以在盐碱地里栽种树木，但覆盖地表和湿地的植被异常丰富，随着地下水位和PH值的细微变化而呈现不同的形态。

youdao

They brought in more than fourteen thousand cubic meters of fertile soil from New Jersey to make it possible to grow trees and other plants.

VOA: special.2009.10.30

Now,he is trying to help people grow trees and plants in the desert -- and save water.

VOA: special.2010.07.13

So trees are actually able to grow on rocks. They have very strong roots."

VOA: special.2010.07.13

Mr. DONATO: Even after this huge, high-severity fire and a tough place to grow trees, we're finding lots of natural conifer regeneration, which was very unexpected.

NPR: Study: Salvage Logging Boosts Forest-Fire Threat

The council bid for a grant from the Big Tree Plant Fund and worked with Trees for Life nursery to grow the trees.

BBC: Man picking apple

The gene they chose is involved in the synthesis of a hormone called gibberellin and, once again, a side-effect of the alteration was to cause the trees to grow faster.

ECONOMIST: GM trees are on their way