a. YUAV TSUM TAU TXAIS KEV SIB HLUB: Khaws qhov chaw nyab xeeb hauv chaw ua haujlwm, khaws lub npog ntsej muag, thiab hnav thaum nyob ze nrog cov neeg tuaj xyuas. Noj tawm thiab tos hauv kab ntawm qhov chaw nyab xeeb. b.PREPARE MASK Thaum mus tom khw muag khoom, khw muag khoom, khw muag khaub ncaws, xinesmas, tsev kho mob thiab lwm yam ...
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