booster
US /ˈbuː.stɚ/
UK /ˈbuː.stɚ/
1.
助推器, 增強器
a device for increasing power or effectiveness
:
•
The car has a brake booster for improved stopping power.
這輛車有煞車助力器，以提高制動力。
•
They installed a signal booster to improve cell phone reception.
他們安裝了訊號增強器以改善手機訊號接收。
2.
加強針, 加強劑
a supplementary dose of a vaccine given to maintain or renew the effectiveness of a previous vaccination
:
•
She received a booster shot for tetanus.
她接種了破傷風加強針。
•
Many countries are recommending a third booster dose for COVID-19.
許多國家正在推薦第三劑新冠疫苗加強針。