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（2023年6月3日）廉政之友 x 天文台之友 義工交流活動 (2023.6.3) Exchange session with Friends of the Observatory
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June 3, 2023
June 3, 2023
（2023年6月3日）廉政之友 x 天文台之友 義工交流活動 (2023.6.3) Exchange session with Friends of the Observatory
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