Since the steel output of our country reached a new high of 100 million tons in 1990s and the government set forth the policy of encouraging the wide application of steel-structure buildings, the steel-structure buildings have been developed swiftly, which has brought a profound change to the building structure system and become the backbone of the times.

In his literary works, Lu Xun praised the spirit of revenge for anti-oppression by using such words as "Mara","intermediate element" and "backbone" in different historical periods and social contradictions.