The meaning of this poem is: In the spring breeze, the willows on the banks of Yu He River are green. It's not convenient to climb recently, it should be because there are too many people leaving.
The whole poem is as follows: East Gate Willow, Royal River Green Tree. It's not so convenient to have a rest recently. It should be because there are too many people.
Appreciation of the whole poem:
The first two sentences of the poem not only point out the time and place of farewell, but also render a strong feeling of parting. "East Gate" set the farewell place in Qingmen, Chang 'an. "Qingqing" means that the color of the willows is already very green, indicating that the time is in late spring. "Liu" is synonymous with farewell, so seeing Liu reminds people of parting. The seemingly quiet environment of the mixed green willows on both sides of the Royal River reflects the poet's reluctance to his friends. And the first sentence is what you see from a distance, and the second sentence is what you see from a close distance. In the sense of distance, it can reflect the figure of the poet's farewell to his friends in the long street, and set off the feeling of being reluctant to part with never say goodbye.
The last two sentences of the poem are lyrical, and they climb the willows by describing others' farewell from the side, reflecting that there are many farewell people. A word "bitter" is not only the inconvenience of climbing willow, but also the sadness of parting. As for the poet himself, he didn't say a word, which set off the poet's farewell affection.