The town will be powered entirely by energy from the sun.

该镇将完全依靠太阳能提供能源。

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The toughest challenge was to build a house that was completely powered by the sun.

最大的挑战就是要建造一所完全由太阳提供电力的房子。

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They can use energy from the sun or can be hand-powered.

它们可以使用太阳能或手动供能。

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They can use energy from the sun or can be hand-powered.

它们可以使用太阳能或手动供能。

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