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A young person is considered Neet if they are unemployed (looking for work) or economically inactive (not actively looking for work and not waiting to start a job or caring for family).
But with her job as commander, she had to pick up the mantle - she was to be in charge of the shuttle's following flight.
简单理解，L3车辆，把车拆了还可以再拼出一台车辆。重要零部件都是多冗余设计。之所以如此，主要是为了合规，让出事概率降低，但成本也一定会水涨船高，遇到特殊情况，也依然需要有人类接管。