Activity clusters list of lines isolated

Recent instruments have extended radial velocity observations from the optical domain to the near-infrared range. In particular, this has allowed to study M dwarfs more...近年来的观测仪器已将视向速度（radial velocity）观测的覆盖范围从光学波段拓展至近红外波段。具体而言，这一进展使得针对M型矮星（M dwarfs）的研究得以更为深入地开展（原文未完整给出后续内容）。