中文总结
你睡觉时开着灯吗？杜兰大学团队9月10日发表在《欧洲心脏杂志》的研究发现：睡觉时即使少量光线也可能伤害心脏。研究追踪了英国生物样本库中超过11000名成年人，他们手腕戴传感器一周测量夜间光照，三年后做心脏磁共振扫描。结果显示，夜间光照超过3勒克斯（差不多是月光或门缝透光的亮度）的人，心脏主泵血腔（左心室）壁变厚、心肌弹性下降——这是心脏功能异常的早期信号。专家建议卧室尽量全黑睡觉。本期词汇：exposure（暴露）、sensor（传感器）、chamber（心腔）、thicken（变厚）、flexible（有弹性的）、an early sign of（…的早期征兆）。睡觉关灯，从今晚开始！
英语知识点
1. exposure /ɪkˈspoʊʒər/ (n.) 暴露，接触
例句：Exposure to light at night may harm your heart.
（夜间接触光线可能会伤害你的心脏。）
2. sensor /ˈsensər/ (n.) 传感器
例句：Each person wore a small sensor on the wrist.
（每个人手腕上戴了一个小传感器。）
3. chamber /ˈtʃeɪmbər/ (n.) 腔，室（如心室）
例句：The walls of the heart's main pumping chamber got thicker.
（心脏主泵血腔的壁变厚了。）
4. thicken /ˈθɪkən/ (v.) 变厚，使变厚
例句：Their heart walls thickened over three years.
（三年间他们的心壁变厚了。）
5. flexible /ˈfleksəbl/ (adj.) 柔韧的，有弹性的
例句：Their heart muscle was less flexible than normal.
（他们的心肌弹性比正常人差。）
6. an early sign of …的早期征兆
例句：It is an early sign of heart problems.
（这是心脏问题的早期征兆。）
7. turn off 关掉（灯、电器等）
例句：Remember to turn off the lights before you sleep.
（睡觉前记得关灯。）
全文参考
Good morning, and welcome to Daily English News. Today is September 25th, 2026. Here is a story about sleep that might change how you set up your bedroom.
A new study from Tulane University, published in the European Heart Journal, says sleeping with the lights on could harm your heart. Researchers followed more than eleven thousand adults from the UK Biobank. Each person wore a small sensor on the wrist for one week, to measure how much light reached them at night. Three years later, they all had a detailed heart scan. The results were clear. People who slept with more than three lux of light, about as bright as moonlight, had thicker walls in the main pumping chamber of the heart. Their heart muscle was also less flexible, which is an early sign of heart problems.
The advice is simple: turn off the lights, and keep your bedroom dark. Sweet dreams, and see you tomorrow.
节目复更中，每天早上更新一条大众英语新闻，读两遍，适合练听力。欢迎订阅！
