The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.
水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。
NASA has reported that there is no such thing as two moons showing in the skies over the world.
美国航天局报告说，从来没有世界各地天空中同时出现两个月亮这样的事情。
Earth may once have had two moons - the one that shines at night today had a smaller companion, according to a new theory.
据英国《每日邮报》8月3日报道：一项新的理论表明，如今在夜晚照耀地球的月亮曾经有一个“小伙伴”，它们一度共同绕地球运行。
Moons are rare in the inner solar system: Venus and Mercury don't have any, and Mars's two moons are tiny pebbles in comparison with ours.
在太阳系内的行星拥有的卫星是很少的，金星和水星没有卫星，火星有两颗卫星，但跟我们的比起来就像是小小的鹅卵石。
And poet Todd Davis, a professor of literature at Penn State University, said this idea of two moons - one essentially swallowing the other - will capture the literary imagination.
宾夕法尼亚州立大学文学教授兼诗人托德·戴维斯称，双月的画面——大月亮最终吞噬小月亮——这样的画面将俘获文人们的心。
Two moons appearing at the same time happens only once every 1, 000 years and isn’t scheduled to reappear until 2287.
两个“月亮”同时出现的情况1000年才发生一次，2287年之前不会重新出现。
Two moons appearing at the same time happens only once every 1, 000 years and isn’t scheduled to reappear until 2287.
两个“月亮”同时出现的情况1000年才发生一次，2287年之前不会重新出现。
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