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Staff members record residents' reservation information of masks inside a residential area of east China's Shanghai, Feb. 2, 2020. Various measures have been taken for epidemic prevention efforts across China. (Xinhua/Gao Feng)

Staff members record residents' reservation information of masks inside a residential area of east China's Shanghai, Feb. 2, 2020. Various measures have been taken for epidemic prevention efforts across China. (Xinhua/Gao Feng)