水星大气及表面成分光谱仪（MASCS）：获取日照和背阳面大气成分剖面；在紫外波段对外溢层尾迹观测；
Mercury Atmospheric and Surface Composition Spectrometer (MASCS): Profiles of atmospheric composition on the day and night sides;
“信使号”将探索水星的表面、地壳、大气，甚至其磁场。
Messenger will explore the surface of Mercury, its crust, its atmosphere and even its magnetic field.
地球被水域所包围，或者是大部分被外围水域所包围，我们拥有大气层，火焰，月亮，水星，金星，太阳等等。
The earth is surrounded by water or largely surrounded by water beyond that we have the sphere of air then fire then the sphere of the moon, mercury, Venus, the sun and so on.
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