Translate an English short article. The translation is about 200 words.

One day, a blind man was sitting on the steps of a building. There was a sign at his feet that read: "I am a blind man, can you help me?"

A creative publicity agent walked up to the blind man and stopped to notice that the blind man had only a few coins in his hat. So he put a few coins in his hat. But he didn't stop to ask the blind man for permission, took the sign, turned it to the back, and wrote a new line. The publicity agent put the sign back in place and walked away.

In the evening of that day, the creative publicity agent returned to the blind man and noticed that his hat was almost full to the brim with coins and bills. The blind man heard his footsteps and asked him if he was the one who had changed his sign. The blind man also wanted to know what the agent actually wrote.

What blind people don’t know is that the new sign reads: “Spring is here, but I can’t see it.”