Once in orbit two of the themis spacecraft will circle earth about one-sixth the distance to the moon while the other two circle half way to the moon.
一旦进入轨道,西弥斯太空船将会在只有地月距离的六分之一的高度处绕地球运转,同时,其他两颗在地月距离一半处绕行。
Once in orbit two of the themis spacecraft will circle earth about one-sixth the distance to the moon while the other two circle half way to the moon.
一旦进入轨道,西弥斯太空船将会在只有地月距离的六分之一的高度处绕地球运转,同时,其他两颗在地月距离一半处绕行。
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