中译英：下载筛选出的BALs光谱数据

We downloaded the spectra containing the BALs that we selected.

Explanation:

• BALs: Broad Absorption Lines, a type of spectral feature observed in the spectra of some quasars and active galactic nuclei (AGN).
• Spectra: The distribution of electromagnetic radiation emitted or absorbed by a substance as a function of wavelength or frequency.

Translation:

We downloaded the spectral data containing the Broad Absorption Lines (BALs) that we had selected.