The European Space Agency (ESA), the Russian Federal Space Agency (RKA) and Nasa have each poured billions of pounds into such a craft without success.
欧洲航天局，俄罗斯联邦航天局和美国宇航局已分别投入到这样一门手艺没有成功数十亿英镑。
The European Space Agency (ESA), the Russian Federal Space Agency (RKA) and Nasa have each poured billions of pounds into such a craft without success.
欧洲航天局，俄罗斯联邦航天局和美国宇航局已分别投入到这样一门手艺没有成功数十亿英镑。
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