Pear flower falls is generally sad.
But only when the wind blows, pear flower falls wrote it herself after all, and only she knows what it means. We can't speculate. Even if it is right to understand according to common sense, the feelings she expressed when she wrote this sentence may not be what we understand. So the best way is to ask herself.
You can try this: write a sentence yourself first and deliberately let him check the next sentence. Find an interface to find him right, for example, if the literary talent is not good and the friend says it is wrong, let her help him guess.
So, you came up with this sentence: whoever pities the catkins floating all over the sky (write a sentence casually), she may think about it (in this way, you remind her to return to the sentence of her signature), or think of her signature immediately. In the case of "pear flower falls knows when the wind blows", you can take the opportunity to ask her: Ah, yes, what does this sentence mean? Explain.
That's settled.
Sure, let me guess the meaning of the original sentence for you:
Pear blossoms are the most beautiful moment, but no one notices her.
Until the wind blows and pear blossoms fall to the ground. Leaving only a sad place.
No one appreciates her beauty, and she can only wait for death.
For specific artistic conception, please refer to Xi Murong's poem "A Tree Blossoms".
Many girls like Xi Murong and prefer the song "A Flowering Tree".