SAN FRANCISCO -- A coalition of 15 U.S. states is filing a new lawsuit challenging President Donald Trump's executive order declaring a "national energy emergency," which aims to accelerate fossil ...

At least eight civilians, including a child, were killed, 35 others injured, and two reported missing early Wednesday after ...

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航空业界正在努力理解为何一架客机与一架军用直升机会在半空中发生致命的相撞事故。一位专家形容，那是“全球控制最严的空域”。