A faint outer bubble, made mostly of hydrogen, marks an earlier period of material sloughed off. Closer to the center, a more complex cloud of mixed gases forms the "brain" inside the shell. Webb's instruments also show more dust glowing in mid-infrared light, while the near-infrared view lets background stars and even distant galaxies shine through.
（二）乏燃料，是指在反应堆堆芯内受过辐照并从堆芯永久卸出的核燃料。，详情可参考旺商聊官方下载
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Александра Качан (Редактор)