This is obviously an inspirational poem:
"Passers-by don't know how to walk beside you" (this "knowing" is not limited to understanding, but also includes the meaning of cognition and appreciation). Why don't people coming and going by the roadside pay attention to you?
"Only your body is embedded in the cloud", because your body is embedded in the cloud. The "falling clouds" here are not gorgeous clouds, or even ordinary clouds. Contains the meaning of loss. This half sentence shows that you are now in a poor situation.
It's better to understand it as "flowers reopen as soon as they are closed" Although the flowers are closed now, they will bloom one day. Metaphorically, although you are unknown now, there are still opportunities for development in the future.
Extending from the above semantics to this, "Again? The three words in "I don't know" meet in degrees, which is really inappropriate. " "Hello again". Who did you meet? There is no such implication in the context. Personally, I think this half sentence should be closely related to the first half sentence: since you have the opportunity to develop, it is not known that you will create more glory through your own efforts and the help of the environment. This is still encouraging the "you" in the poem to cheer up as soon as possible and strive to realize the value of life.
I don't think I've thought about "?" What words are embedded? I just hope to find the source as soon as possible. Let's have a look.