He said NASA will now add an additional flight in 2027 in which astronauts will dock with new commercial moon landers in low-Earth orbit for detailed tests of navigation, communications, propulsion and life support systems and to verify rendezvous procedures.
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(There are other emergencies that could bring us to this point. One is a fire, which could result from machinery shorting. Another is a toxic ammonia leak. But these are even more unlikely.)，这一点在safew官方版本下载中也有详细论述