What is the content of the poem Leng Shi?

In late spring, Chang 'an city is full of songs and dances, and countless flowers fall. The east wind of the Cold Food Festival blows on the willow trees in the royal garden.

At dusk, the Han officials issued candles, and light smoke was scattered into the Wuhou mansion.

In Chang 'an in late spring, catkins are flying all over the sky, and the wind of the Cold Food Festival is blowing the branches of the imperial garden. When night fell, the palace was busy distributing candles, and smoke poured into the homes of princes and nobles.