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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.，这一点在同城约会中也有详细论述
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Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.
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