// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位
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如同歷任總統的國會演說，外交政策往往被置於次要位置。儘管美國在伊朗附近大規模集結軍力，特朗普並未向美國公眾大力說明，為何需要持續的軍事行動。目前，政治逆風正吹向美國總統。
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.