GUIYANG, Sept. 28 (Xinhua) -- The world's highest bridge opened to traffic Sunday morning in southwest China's Guizhou Province, slashing travel time across a deep canyon from two hours to just two ...

高铁轮轨姿态反映了车轮与钢轨之间复杂的动态相互作用和约束关系，掌握他们之间真实接触姿态是保障高速铁路安全运营的重要基础。如何能够精确获得高铁轮轨姿态一直是国内铁路科研的热门研究领域。但单单从二维图像上获取轮轨接触姿态是不精确、不 ...

Space travel has been possible for some time and some people think the space tourism could be developed in the future.Do you think it is a positive or negative development?

在出门旅行前收拾行李时，有人喜欢把大大小小的东西都装好，以确保万无一失；有的人则倾向极简主义，只携带必备用品，这些人会到达目的地后再购买其它的物品。“Travel light 轻装旅行”这个说法指后者的出行理念，即旅游时所携带的物品很少。在这里 ...