1969年3月至8月间,中苏边境接连爆发了几起冲突事件,之后,大军压境的苏联于下半年又私下向美国等国试探对中国核设施发动突然袭击的可能性。在此背景下,我国开展了紧张的战备和疏散在京中央领导人的工作。 From March to August 1969, several conflicts broke out on the border between China and the Soviet Union. After that, the heavily stricken Soviet Union tentatively explored into the United States and other countries the possibility of launching a surprise attack on China’s nuclear facilities in the second half of the year. Against this background, our country has carried out intense war preparations and evacuated the work of the leaders of the Central Government of Beijing.