"Ercao" here refers to people who are "frivolous for writing" as mentioned in the previous sentence.
These two poems are from the Tang Dynasty poet Du Fu's Six Poems in Plays? Second, the original text reads: "Wang Yang and Luo Lu were at that time, light and thin. Second, Cao's name is ruined, and he does not waste rivers and mountains. "
The main idea of this poem is that the styles of four poets, Yang Jiong, Lu and Luo, were the fashion at that time, and some frivolous people wrote articles and laughed endlessly. You people who laugh at others have long since disappeared, but the poems of the four great poets are as long as the Yangtze River.
It can be seen from the interpretation that the poet satirizes those who write articles mocking Wang, Yang, Lu and Luo.