时隔近两个月，西班牙政府于近日公布了4月伊比利亚半岛大范围停电事故原因。西班牙政府发布报告称，停电发生当日发现电网电压激增、但电网和电厂等有关运营机构未能有效应对，从而引发后续严重连锁反应。

A groundbreaking 3D printing system developed by Chinese scientists has explored using only on-site-sourced lunar soil to ...

RIO DE JANEIRO, July 7 (Xinhua) -- To Brazil, the "Land of the Future" has meant more than a tribute by Austrian writer Stefan Zweig who took refuge in the South American country from war in the 1940s ...