14-02-16 The United States has warned airlines that terrorists looking to disrupt the Olympic Games in Sochi, Russia, could conceal bomb-making components in toothpaste tubes or skin care product containers, CBS News confirmed Wednesday. 俄罗斯索契冬奥会开幕...

12-07-18 A network of p orous（多孔渗水的） carbon tubes that is three-dimensionally interwoven（互相编织） at nano and micro level -- this is the lightest material in the world. It weights only 0.2 milligrams per cubic centimetre, and is therefore 75 times...