芝加哥，这个夏季正在与野火烟雾进行一场“持久战”。7月31日，伊利诺伊州再次发布空气质量警报，全州34个郡的空气质量均被评为“对所有居民不健康”。其中，芝加哥的空气污染指数一度冲上全球125个城市中的首位，成为全球空气质量最差的城市。专家紧急提醒，即便待在室内也并非完全安全，因为室内空气质量往往与户外一样糟糕，甚至更差。

WASHINGTON, Aug. 1 (Xinhua) -- U.S. President Donald Trump on Friday announced that he has ordered the firing of Erika McEntarfer, commissioner of the Bureau of Labor Statistics (BLS), accusing her of ...

结果显示，症状发生3小时内启动强化降压（目标收缩压<140 mmHg）可显著改善功能恢复，减少神经功能恶化、死亡和严重不良事件风险，而对血肿扩大的影响不显著。尤其在3小时内启动治疗者，获益最为显著。

CHONGQING, Aug. 2 (Xinhua) -- For Jiang Lifang, a 61-year-old retired teacher in southwest China's Chongqing Municipality, life is anything but dull. Her day starts at 7 a.m. with a cheerful singing s ...

LOS ANGELES, Aug. 1 (Xinhua) -- The Trump administration is suspending federal research funding to the University of California, Los Angeles (UCLA), one of the top public universities in the United ...