20250607 10分鐘短講 大阪博覧會中國舘內「蛟龍號」的故事 羅時成

Round-17 hunt: picked; source: new-source search (r17: learned societies, museum/library lecture series, summer schools, scholarly conferences, newly covered languages); channel screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality tier C + tier-C depth check passed; strict per-title check + final strict pass; oEmbed verified.