修改语法和拼写错误使句子符合英文期刊论文要求： Variability of broad absorption lines BALs; with absorption widths 2000 km s−1; Weymann et al 1991 is a common phenomenon on quasar spectra
Variability of broad absorption lines (BALs) - with absorption widths greater than 2000 km/s (Weymann et al., 1991) - is a common phenomenon in quasar spectra.
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