k--; // 剩余删除名额减1（关键：控制删除位数，保证保留足够长度）
They were 200,000 miles above the Earth and closing in on their target when they needed to stir tanks containing vital oxygen and hydrogen.
。搜狗输入法2026对此有专业解读
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It's a job that can only be done under the cover of darkness.
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