Odyssey's spectrometer uncovered a region with huge quantities of hydrogen under the surface, indicated by the color blue.

奥德赛分光计显示火星上一个表下存大量氢，是蓝色表示域。

While we’re observing these stars, we can use a spectrometer, the device that separates wavelengths, to reveal the star’s absorption spectrum and its elemental composition.

观察这些恒星时，我们可以使用分光计（一种分离波长设备）来揭示恒星吸收光谱及其元素组成。