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オペ室で働いていたとき、帝王切開で赤ちゃんが生まれた瞬間に…
→ “When I was working in the operating room, at the exact moment a baby was born via C-section...”
オペ室 ope-shitsu = operating room (n.)
オペ ope = opera / operation
室 shitsu = room
で de = at / in (location particle)
働 hatarak = to work (v.)
いて ite = being / staying (te-form of iru)
いた ita = was / past tense marker
とき toki = when / time (n.)
、 = comma (punctuation)
帝王切開 teiou-sekkai = C-section / cesarean section (n.)
帝王 teiou = emperor
切 ki = cut / incision
開 kai = open
で de = by means of / via (instrumental particle)
赤ちゃん akachan = baby (n.)
が ga = subject marker particle
生ま uma = to be born (v.)
れた reta = past tense passive/indirect form
瞬間 shunkan = moment / instant (n.)
に ni = at / upon (time/location particle)
… = ellipsis (suspense indicator)