booster
Definition
A person or thing that promotes or increases something; also, a supplementary dose of a vaccine.
中文 促进或增加某物的人或事物；也指疫苗的补充剂
Example
"She got a booster shot to strengthen her immunity."
A person or thing that promotes or increases something; also, a supplementary dose of a vaccine.
中文 促进或增加某物的人或事物；也指疫苗的补充剂
"She got a booster shot to strengthen her immunity."