Bill Gates: 人们很容易忘记脊髓灰质炎在美国和世界各地的可怕程度。这是一个强有力的提醒。 b-gat.es/3pIOQlp

原推：It’s easy to forget how scary polio was in the United States and around the world. This is a powerful reminder. b-gat.es/3pIOQlp
https://twitter.com/BillGates/status/1562845130436255745