追溯 zhuī sù — lit. to go upstream
zhuī (first tone, high and level) sù (fourth tone, falling)zhui1 su4
lit. to go upstream
Levels 7–9· 2021 three-band, nine-level proficiency standardverb
Meanings
lit. to go upstream
lit. to go upstream; to trace sth back to; to date from
verb