Friends of the Earth help keep the environment clean.

地球之友协助保持环境清洁。

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Are they the people who help to keep the environment clean?

他们是帮助保持环境干净的人们吗？

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Friends of the Earth help to keep the environment clean.

地球的朋友帮助保持环境干净。

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Friends of the Earth help to keep the environment clean.

地球的朋友帮助保持环境干净。

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