Biden dung chien thuat nay muc dich chinh la de khoi bi hố khi di tranh cu chu chang phai la tuan theo tieu chuan ngua covid-19 cua CDC dau. Bang chung: Khi ho thi ong nay keo khau trang xuong de ho roi sau do dung khau trang che tro lai. Ong nay dau co biet cong dung cua khau trang la gi dau, chi la dua tre duoc nguoi lon (cac co van) khuyen bao sao thi lam vay.
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