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Booster
01
助推器
a rocket that gives a spacecraft or missile the extra power it needs to leave the Earth's atmosphere
02
加强针
an additional dose of vaccine required periodically in order to increase, maintain, or renew the effects of a previous one
What is a "booster"?
A booster is an extra dose of a vaccine given to strengthen the immune response after the first doses. Boosters are typically given after the first vaccination series to ensure long-term protection against certain diseases. They help strengthen the body's defense and provide added protection against infections that may decrease over time or need extra support.
03
信号放大器
an amplifier for restoring the strength of a transmitted signal
04
小偷
a thief who steals goods that are in a store
05
支持者
someone who is an active supporter and advocate
06
支持者
a person who backs a politician or a team etc.
07
助推器
something that enables a person or thing to improve or increase
例子
Some vaccines require boosters to maintain their effectiveness, even if they are live.
Using a rocket booster, they propelled the spacecraft into orbit.
