始業 しぎょう
shigyō

Noun
Suru Verb

1. start of work; commencement; opening

Intransitive
教室 きょうしつ はいって せき くのとほぼ同時 どうじ、始業 しぎょう らせるチャイムの おと ひびく。
kyōshitsuni haitte sekini tsuku noto hobo dōjini shigyōo shiraseru chaimuno otoga narihibiku.
About the same time as he entered the classroom and arrived at his seat, the chime to announce class rings across the school.