In the early 1960s, we were behind the developed countries in science and technology, but the gap was not so wide.However, over the past dozen years, the gap has widened because the world has been developing with tremendous speed.

• 六十年代前期我们同国际上科学技术水平有差距，但不很大，而这十几年来，世界有了突飞猛进的发展，差距就拉得很大了。