短語詞組短語low -Earth orbit 衛(wèi)星low altitude earth orbit 低軌道low w Earth orbit 近地軌道Low -earth orbit satellites 低軌道衛(wèi)星LE Low -Earth Orbit 低地球軌道low earth orbit satellite 低軌衛(wèi)星;近地球軌道衛(wèi)星;低軌道地球衛(wèi)星;衛(wèi)星low earth orbit launch 近地軌道發(fā)射low earth orbit environmental 低地球軌道環(huán)境 返回 low earth orbit