中文导读 华盛顿大学团队估算：若美国永久实行夏令时，K–12学生每年至少会多出约二十亿次日出前上学通勤；华盛顿州约增3500万次，佐治亚州约增7100万次。研究覆盖已预批永久夏令时的19州中的14州，结合上课时间、入学人数与地理坐标，并对照现行夏令时／标准时切换。全国推算假设约8点离家，作者称可能低估。时区西缘与早于8点上课的学区（如密西西比、阿拉巴马由约200万升至逾2000万）受影响更大。美国致命学龄行人车祸在黑暗清晨约为日出后两倍；清晨光照也关乎昼夜节律。众议院已通过全年夏令时法案，参议院仍搁置。UW News 2026-10-29；《Current Biology》DOI 10.1016/j.cub.2026.10.014。阅读时可留意 daylight、sunrise、standard、fatal、schedule 等词，以及 may、assumed 如何保留估计边界。
正文 Brighter winter evenings sound attractive . A new University of Washington study warns that making Daylight Saving Time permanent would also mean far darker school mornings for American children . The team estimates at least two billion extra dark trips to school each year , and it links dark mornings to higher pedestrian danger . The findings appear in Current Biology and were reported by UW News on 29 October 2026.
本段译文 更亮的冬夜听起来很有吸引力。华盛顿大学一项新研究警告：若永久实行夏令时（Daylight Saving Time），美国儿童上学的清晨会暗得多。研究团队估计，每年至少会多出约二十亿次天未亮的上学行程，并把黑暗清晨与更高的行人风险联系起来。结果发表于《Current Biology》，并由 UW News 于2026年10月29日报道。
This past summer , the U .S . House of Representatives passed a bill that would keep Daylight Saving Time year - round . Nineteen states have already approved the change , but the measure is still stalled in the Senate . Permanent Daylight Saving Time would shift an hour of light from morning to evening from November through March . Children with fixed school start times would feel that shift most clearly
本段译文 今年夏天，美国众议院通过一项全年保持夏令时的法案。已有十九个州提前批准这一变化，但法案仍在参议院搁置。永久夏令时会在十一月至三月把一小时的光照从早晨挪到傍晚。上学时间固定的儿童，会最清楚地感受到这一变化。
Researchers studied 14 of those 19 states . They combined school start times , enrollment figures , and geographic coordinates , then counted how often students would travel before sunrise under permanent Daylight Saving Time versus the current switch between Daylight Saving Time and Standard Time . In Washington state alone , the change would add nearly 35 million dark school trips . Georgia showed the largest rise among the 14 states , about 71 million more trips .
本段译文 研究者考察了这十九个州中的十四个。他们结合各校上课时间、入学人数与地理坐标，统计在永久夏令时与现行夏令时／标准时切换制度下，学生在日出前出行的次数。仅华盛顿州，这一变化就会增加近三千五百万次黑暗上学行程。在这十四个州中，佐治亚州增幅最大，约多出七千一百万次。
A national estimate based on those patterns reached at least two billion additional dark commutes . Lead author Guadalupe Rodr íguez Ferrante notes that the national figure assumed students leave home around 8 a .m ., which is fairly late , so the true total may be higher . The hardest - hit places would include communities on the western edge of a time zone and schools that begin early . In Mississippi and Alabama , where average starts fall before 8 a .m ., dark trips would jump from about two million to more than 20 million in each state
本段译文 据此推算的全国估计至少再增加二十亿次黑暗通勤。第一作者 Guadalupe Rodríguez Ferrante 指出，全国数字假设学生约在早上八点离家，这一时间偏晚，因此真实总数可能更高。受影响最重的，包括时区西缘社区以及很早上学的学校。在密西西比与阿拉巴马，平均上课时间早于八点，黑暗行程将分别从约两百万次升至两千万次以上。
Safety and body clocks both matter Traffic records suggest fatal crashes involving school-aged pedestrians are roughly twice as likely on dark mornings as after sunrise . Morning daylight also helps set the circadian clock that guides sleep , mood , and appetite Senior author Horacio de la Iglesia argues that darker mornings would hit children unequally because they must arrive at fixed hours . Delaying school start times under permanent Daylight Saving Time , he adds , would simply push work and evening light later until society realigns with solar time — which is Standard Time by definition
本段译文 安全与人体生物钟都很重要。交通记录显示，涉及学龄行人的致命车祸，在黑暗清晨发生的可能性大约是日出后的两倍。清晨日光也有助于设定调节睡眠、情绪与食欲的昼夜节律钟。资深作者 Horacio de la Iglesia 认为，更暗的早晨会不均等地影响儿童，因为他们必须在固定时间到校。他还补充：在永久夏令时下推迟上学时间，只会把工作和傍晚光照一并后移，直到社会重新对齐太阳时——而那按定义就是标准时。
The study does not claim the bill will pass , and it does not measure every child’s actual leaving time . Still , it turns a clock debate into concrete numbers about morning darkness , safety , and school schedules
本段译文 研究并未断言法案一定会通过，也未测量每个孩子实际离家的时间。不过，它把一场改钟争论，变成了关于清晨黑暗、安全与学校时间表的具体数字。
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