例如，他们在学校或医院工作，或者他们做一些有利于环境的事情。

For example, they work in schools or hospitals, or they do something helpful for the environment.

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这篇论文详细报道了无钴、无铅及有利于环境的排气阀座圈的开发与使用。

This paper reports the development and the application detail of cobalt-free, lead-free and environmentally friendly exhaust valve seat insert.

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选用质优价高的燃料：要是让你的汽车改用生物油不可行，就购买贵一点但是有利于环境的质优价高的燃料。

Use premium fuel: If it is not possible to change the type of fuel your car can run on to bio, purchase the more expensive but environmentally friendly premium petrols.

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