它们也可以是对环境友好的。

They can also be friendly to the environment.

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它提供对环境友好的产品或服务，以取代对非绿色产品的需求。

It supplies environmentally friendly products or services that replace the demand for nongreen products.

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它可以居住六人，由对环境友好的太阳能和氢气驱动。

It's designed for up to six people to live in, and is powered by an environmentally-friendly combination of solar power and hydrogen tanks.

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