What Do We Know About The Delta Variant?
Ta Biết Gì về Biến Thể Đen-ta?
Intermediate Level
https://www.facebook.com/le.quocan.146/videos/583773196115635
Dan Novak
Dan Novak adapted this story from reporting by The Associated Press.
Susan Shand was the editor.
(Subtitled by Le Quoc An’s...
