This song is filled with metaphors and constructions which you wouldn’t find in English. Also, the events described in the song are not chronological, and the person to whom they relate changes from line to line without necessarily being explicit about it… which is why I would give this song a difficulty rating of ‘medium-hard’. At least each line rhymes! Hopefully the notes are helpful.
There’s a dragonfly on the fence
The bottle [on the ground] has given birth to a small forest
[Lit. Glass bottle inside insert-full small-small forest]
[方文山 often describes the scenery at the start of each song. From the rest of the song, you can infer that the singer is visiting the house where he and his lover used to stay. Since it’s now springtime, plant-life has erupted everywhere, including inside a bottle that was somewhere on the premises.]