最新的
reading
1.landing safely
在某个时间里,four spacecrafts crashea
因为computer error
2.carry fuel
spacecrafts需要carry large amounts of fuels for its way to Mars as well as back then
3.radiation
没有和esrth magnetic field一样的protection
最新的
reading
1.landing safely
在某个时间里,four spacecrafts crashea
因为computer error
2.carry fuel
spacecrafts需要carry large amounts of fuels for its way to Mars as well as back then
3.radiation
没有和esrth magnetic field一样的protection
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