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Фото: Cynthia Griggs / Reuters
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But questions remain about how realistic the goal and timeframe are, given recent and steep Nasa budget cuts, and some scientists are concerned that the plans are driven by geopolitical goals.，这一点在爱思助手下载最新版本中也有详细论述
Watch: How the Tumbler Ridge school shooting unfolded，推荐阅读搜狗输入法下载获取更多信息
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