第四步，LLM 一次总结。为每个时间窗口生成活动描述。
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Uses minimal resources without sacrificing usability.
Over half of Americans, 60%, say a weeklong vacation is unaffordable—and even 49% report the small joy of going out to dinner is out of their budgets. Around 74% also say buying a new car is too expensive, but beyond these commonplace “luxuries,” U.S. adults are battling the exorbitant costs of everyday essentials. Among those who were surveyed, many found healthcare (56%), energy utilities (45%), and groceries (45%) to be out of their price range.