O
volume
British pronunciation/ˈə‍ʊ/
American pronunciation/ˈoʊ/

"o" 的定义和意义

01

the blood group whose red cells carry neither the A nor B antigens

02

the 15th letter of the Roman alphabet

example
例子
examples
Blood type O is known as the universal donor because it can be given to recipients of any blood type.
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