「上溯」

(pos:動詞)
<explanation>
yue:#追溯 到過去；揾返、追蹤返最早開始嘅時間
eng:to trace back (to the past); to date back
<eg>
yue:粵語有一啲按口語而撰寫嘅古老文本，最早上溯到十九世紀早期。 (jyut6 jyu5 jau5 jat1 di1 on3 hau2 jyu5 ji4 zaan3 se2 ge3 gu2 lou5 man4 bun2, zeoi3 zou2 soeng6 sou3 dou3 sap6 gau2 sai3 gei2 zou2 kei4.)
eng:There exist some old Cantonese texts written based on the vernacular, with the earliest dating back to the early 19th century.