su4
to go upstream; to trace the source

su4
variant of 溯

strokes 13
radical
strokes after radical 10
回溯 回溯 hui2 su4
to recall; to look back upon

逆流溯源 逆流溯源 ni4 liu2 su4 yuan2
to go back to the source

溯源 溯源 su4 yuan2
to investigate the origin of sth; to trace a river upstream back to its source

推本溯源 推本溯源 tui1 ben3 su4 yuan2
to go back to the source

推溯 推溯 tui1 su4
to trace back to

寻根溯源 尋根溯源 xun2 gen1 su4 yuan2
see 追根溯源

追根溯源 追根溯源 zhui1 gen1 su4 yuan2
to pursue sth back to its origins; to trace back to the source; to get to the bottom of sth

追溯 追溯 zhui1 su4
lit. to go upstream; to trace sth back to; to date from