Even as Mawr stadium sized vaccination centers open up like the one built in Boston's Fenway Park, America's vaccine rollout has been hampered by a lack of supply, something President Biden vowed to fix.
即使像在波士頓芬威公園建造的Mawr體育場大小的疫苗接種中心開放,美國的疫苗推廣也因供應不足而受阻,拜登總統發誓要解決這個問題。