It is necessary to protect trees from the frost.

必须保护树木免受霜冻。

youdao

In order to protect trees, we should not cut down trees for throwaway chopsticks.

为了保护树木，我们不应该再为了制作一次性筷子而砍倒树木。

youdao

In order to protect our environment, immediate actions should be taken, such as stopping cutting down trees.

为了保护环境，我们应立即采取措施，例如停止砍伐树木。

youdao

He says farmers are acting on their own to protect and plant trees.

VOA: special.2009.09.01

Because it was April, there was still a danger of frost, or even snow, so some of the trees were wrapped up to protect them.

VOA: standard.2010.08.09

Spokeswoman Anna Richardson said the company had redesigned the layout to protect trees on the site and brought in specialist landscape consultants.

BBC: Harestone House

Forestry Commission Wales staff are liaising with the owners of infected trees and have written to landowners offering guidance and urging them to take simple precautions to protect ash trees close to infected new plantings.

BBC: Ash dieback: First three Wales cases of 2013 in woods

But because it requires open, light conditions to thrive, park managers need to fell trees to protect it.

BBC: Campaign to protect rare lichens in Pembrokeshire