We have learned that we cannot live without nature's elements... we need clean air to breathe, food to eat, energy from the sun, etc.

我们还认识到，离开了自然中的元素，我们也无法生存——我们需要呼吸洁净的空气，需要食物来吃，还需要从太阳获得能量。

youdao

We need clean air, but unfortunately, air pollution is generally present, especially in cities。

我们需要清新的空气，但遗憾的是，空气污染普遍存在，在城市中尤其如此。 [分析] 本句为了避免“尤其是在城市里”的表达不完整，增加了“如此”。

youdao

We need clean air, butunfortunately, air pollution is generally present, especially in cities.

我们需要清新的空气，但遗憾的是，空气污染普遍存在，在城市中尤其如此。

youdao

"And we need to clean up so that they can come and build new residential places for our families here."

VOA: standard.2009.10.04

"It was so expensive to clean up after this crisis, we need more safety - even if it makes loans a little more expensive."

VOA: standard.2010.03.16

We need clean water not only to sustain ourselves, but also for other basic necessities such as farming and sanitation.

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We need clean coal in the U.S., and melding the technology with oil recovery is a smart way to make it economic.

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We need clean capacity.

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