Elon Musk: @Erdayastronaut @flightclubio 消耗性上级可能会飞也可能不会飞，但这是一个选项

原推：@Erdayastronaut @flightclubio Expendable upper stage may or may not fly, but it is an option
https://twitter.com/elonmusk/status/1620510679424995328