NASA's Mercury probe Messenger has become the first spacecraft to go into orbit around the closest planet to the Sun.
美国国家航空航天局(NASA)的信使号水星探测器成为有史以来第一个到达水星轨道的空间飞行器。
Messenger will become the first spacecraft to orbit Mercury and the first mission there since Mariner 10 in 1975.
“信使”号将成为第一个绕水星飞行的航天器,它也是1975年“水手10号”接近水星后的第一次近水星探测活动。
Mercury was visited first by the Mariner 10 probe in the 1970s; and by Messenger currently
在1970年水手10号探测器第一次造访水星,目前信使号在执行水星探测任务。
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