The ESPN Wide World of Sports Complex has hosted several bubbles, including the NBA and Major League Soccer. A<unk> , also known as a bubble, or hub city, is a hosting arrangement for sporting events that emerged during the COVID-19 pandemic, under which events are held at a centralized site, often behind closed doors, with strict quarantine and safety protocols in order to prevent the spread of COVID-19. A bubble may be established for a single sports season, tournament, or for an ongoing series of events, allowing them to still be held and made available to broadcast audiences.
Bio-secure bubble
Auscultatory gap
Saber-sheath trachea
Autoinflation
Double bubble 
Companion shadow
Visakhapatnam gas leak
Bird fancier's lung