追溯
zhuī​sù HSK7

to trace back

zhuī​sù to trace back
  1. 追 zhuī verb
    to reminisce
    (bound form) to recall; to reminisce; to look back on the past
  2. 溯 sù verb
    to trace back
    (bound form) to trace back to a source; to recall or look back on the past

zhuī​sù to go upstream
  1. 追 zhuī verb
    to chase
    to chase; to pursue; to follow closely in order to catch up
  2. 溯 sù
    to go upstream
    (bound form) to go against the stream; to sail or travel upriver