| 追 |
zhuī sù | lit. to go upstream / to trace sth back to / to date from |
| 追 |
duī | to sculpt / to carve / musical instrument (old) |
| 追 |
zhuī | to chase / to pursue / to look into / to investigate / to reminisce / to recall / to court (one's beloved) / to binge-watch (a TV drama) / retroactively / posthumously |
| 溯 |
sù | to go upstream / to trace the source |
| 溯 |
sù | variant of 溯 |