CORONAVIRUS: 疾病预防控制中心主任说，可能不需要每年注射加强针，第三针可能足以提供所需的长期保护。
CORONAVIRUS: Director of the CDC says annual booster shots may not be required and that a third shot may be enough to offer the long-term protection needed
— The Spectator Index (@spectatorindex) 2021-08-21 13:40