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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb
start of work, commencement, opening
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教室に入って席に着くのとほぼ同時に、始業を知らせるチャイムの音が鳴り響く。
About the same time as he entered the classroom and arrived at his seat, the chime to announce class rings across the school.
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