What is the meaning of catastrophe in Ode to China?

Natural disasters, aggression. "Before that, you also saw a catastrophe. But in the midst of great trouble, you will really get to know me, China. At that moment, the dragon children all over the world became a family. The joint efforts of hundreds of millions of people have created earth-shattering myths. " The sons and daughters of China are all new, fighting against natural disasters and disasters brought about by aggression. This poem is from Ode to China, which was written by Zhang, a professor at National School of Administration and director of China Calligraphers Association for two months. It is used to express our admiration for our motherland. As China teenagers in the new era, we are proud of the prosperity of our motherland, and we should shoulder the responsibility of defending our motherland and rejuvenating China!