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Shanghai International Optics Fair
The 20 SIOF 2021 Shanghai International Optics Fair SIOF 2021 unachitikira pa May 6-8 2021 pa Shanghai World Expo msonkhano & Convention Center. Unali chiwonetsero choyamba ku China pambuyo pa mliri wa covid-19. Chifukwa cha e...Werengani zambiri