China's domestically developed C909 passenger jet has begun commercial operation in Vietnam, further expanding its presence ...

在八闽大地的西部，有一座有着自然风光与深厚历史文化底蕴相融的宝库。它就是广州市的对口合作城市——龙岩。上月，武梅铁路广东段首个承台完成浇筑，施工正在加速推进。武梅铁路建成开通后，龙龙高铁将实现全线贯通，届时龙岩至梅州、深圳、广州将分别缩短至1小时、2 ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.