润色：Recent numerical simulations have also shown that when low ionization absorption features presented the BALs are wider and deeper while high ionization species exhibit higher blue-edge velocities c

Recent studies have further substantiated the notion that low ionization absorption features result in broader and more pronounced broad absorption lines (BALs), whereas high ionization species tend to exhibit greater velocities at the blue-edge compared to low ionization lines (Matthews et al., 2016).