为啥回去这么难

https://www.youtube.com/watch?v=P_Brfn9Lquw&ab_channel=Dr.PaulM.Sutter

https://www.youtube.com/watch?v=eJ3dsXP839U&ab_channel=TheSpaceRace

https://www.youtube.com/watch?v=oJ0Pn6x_xhQ&ab_channel=60Minutes

https://www.youtube.com/watch?v=OWOAzBC9aRs&ab_channel=TheSpaceRace

加燃料



需要加10次燃料