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Soldiers of the Chinese People's Liberation Army (PLA) Garrison in the Hong Kong Special Administrative Region (HKSAR) donate blood in Hong Kong, south China, Aug. 9, 2019. (Xinhua/Yi Ding)

Soldiers of the Chinese People's Liberation Army (PLA) Garrison in the Hong Kong Special Administrative Region (HKSAR) donate blood in Hong Kong, south China, Aug. 9, 2019. (Xinhua/Yi Ding)