修改用词及语法错误使更符合天体物理学术论文要求： To put further constraints on the origin of the variability of our LoBAL subsamples it is necessary to check individual spectra which is beyond the scope of this paper

To provide additional limitations on the source of variability in our LoBAL subsamples, it is imperative to examine individual spectra. However, this task falls outside the purview of this paper.