“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。
Messenger will become the first spacecraft to orbit Mercury and the first mission there since Mariner 10 in 1975.
它每十二小时绕水星一周，将填补早先它两次飞掠和水手十号1974、1975年照片的视觉视角。
The spacecraft will orbit about once every 12 hours and fill in the visual gaps left by it's two earlier flybys and the images snapped by Mariner 10 between 1974 and 1975.
它每十二小时绕水星一周，将填补早先它两次飞掠和水手十号1974、1975年照片的视觉视角。
The spacecraft will orbit about once every 12 hours and fill in the visual gaps left by it's two earlier flybys and the images snapped by Mariner 10 between 1974 and 1975.
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