The space shuttle was an attempt at a reusable rocket, but even the main tank of the space shuttle was thrown away every time, and the parts that were reusable took a 10,000-person group nine months to refurbish for flight.
航天飞机的目的就是为了使火箭可以重复利用， 但是即便是航天飞机的主油箱每次都要用完就扔， 而可以重复使用的零部件 要用1万人的队伍花9个月的时间来更新。