短语词组短语brown dwarfbrown dwarf star 棕矮星proto -brown dwarf 原褐矮星sub -brown dwarf 外存在一个亚褐矮星brown dwarf star 棕矮星brown dwarf desert 褐矮星沙漠dwarf brown layer 矮小型褐壳蛋鸡 返回 brown dwarf