Interpreting stellar spectra was a tough problem.

解释恒星的光谱是一个难题。

I had seen a lot of stellar spectra before, but nothing like this.

我以前见过很多恒星光谱，但从没见过这样的。

That’s a classification scheme created by Annie Jump Cannon in the early 1900s based on stellar spectra.

这是 Annie Jump Cannon 在 1900 年代初期根据恒星光谱创建的分类方案。

The researchers from the National Astronomical Observatory of China analyzed over 5 million stellar spectra obtained from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) in North China's Hebei Province.

中国国家天文台的研究人员分析了 500 万来自中国北方河北省的大天区面积多目标光纤光谱天文望远镜（英文缩写LAMOST）的恒星光谱。