What sentence does Du Mu say in "Bo Qinhuai" satirizes the upper class who only care about their own enjoyment and ignore the difficulties of the country?

This poem is; Strong women in business don't know how to hate their country, but they still sing backyard flowers across the river.

This poem expresses sober feudal intellectuals' worries about state affairs, and also reflects that bureaucrats and nobles are filling their decadent and empty souls with songs and dances, which is exactly a portrayal of two different aspects in the real life of the declining late Tang Dynasty.