khai-sí開始

to start

to start; to begin; to commence; start; beginning; commencement

English Wiktionary, “開始” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%96%8B%E5%A7%8B · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)