Yiyi
Explanation
(1) Nostalgic, unable to bear separation.
(2) Weak. Reluctantly attached
(3) Describes the way branches are weak and swaying in the wind. It is taken from the famous line in the Book of Songs, "I have passed away, and the willows are still there."
(4) Lingering in the mind, very nostalgic. Taken from the sixth lesson of the seventh-grade Chinese language of the Jiangsu Education Press, "The Past".
Yiyi in the Book of Songs
In the past, I went there, and the willows were Yiyi; now I come to think about it, and the rain and snow are falling.
Recalling that when we set out for the expedition, the willow trees were still blowing in the wind; now on the way back, heavy snow is flying all over the sky.
Past: refers to the time of war.
Yiyi: lush appearance. One thing to say is attachment to appearance.
Thinking: the particle at the end of the sentence.
Feifei: Snowy appearance.
In the past, I left, and the willows lingered. Now, I come to think about the rain and snow.