What is the backbone of China?

Since ancient times, the Chinese nation has had people who have done harm for the people, people who have done harm for the people, and people who have dedicated themselves to the law. -They are the backbone of China.

-Lu Xun

The original text is:

Mr. Lu Xun once said: Since ancient times, the Chinese nation has had hard-working people, hard-working people, people who have dedicated themselves to the law, and people who plead for the people ... They are the backbone of China. All the ancestors who explored saving the country and the people are the backbone of China, the great heroes of War of Resistance against Japanese Aggression are the backbone of China, and we will surely become the backbone of the rejuvenation of the Chinese nation in the new century!