What is the meaning of "If you have empty bottles of wine, you can sell them"?

What does the phrase "if you have empty bottles of wine for sale, you can sell them" mean?

The story is about a crippled old man who collects empty bottles of wine to support himself. The old man is a bit deaf and mute, he can't speak, he is alone, and his life is hard enough, but one day he finds a child on the street, and he is overjoyed, and thinks that it is the only gift that God has ever given him.

The old man will bring the child home, with the hard work of collecting empty bottles of wine for money to buy cheap powdered milk so that the little girl survived, the girl picked up a puppy at the age of 6, named Wangcai, puppy, deaf and mute old man, the little girl living together, the little girl's childhood in the pile of empty bottles of wine in the mountains of growth, born with a good voice so that she has become the deaf and mute people's transmitter, in every morning! The girl held the old man and leaned on her crutches. The girl shouted loudly: wine dry, wine dry, wine dry.

And then, the little girl grew up and fell in love, she fell in love with a lyricist, the young lyricist was penniless, but loved her very much, took her into the world of art, wrote many songs for her, and was very good to the old man, every time he came, he would help the old man to carry bottles of wine! And the old man compared to talk, teasing Wangcai, however, one day the girl became famous, life has changed qualitatively, the house, the car, around the pursuit of people, the girl still loves the boy, persuade him to live with her into a large villa, do not go back to the bottle house, because and deaf and mute father, so that she felt humiliated! The boy was reluctant, still and the old man to come and go, and then the girl is more and more busy, more and more fame, life is completely arranged by the economy, the old man misses his daughter, begged the boy to take him to look for his daughter, but not yet into the concert door was coaxed out of the girl later, the girl is also annoyed, threw to the old man a sum of money so that he will not bother, the old man wiped away the tears in the eyes, did not want to the girl's pennies, and when he went away, he also left the girl has always been loved by the The old man wiped away his tears and didn't ask for a penny from the girl!

The boy could not see past it, looking for the girl theory, the girl's heart can not hear any persuasion, because the two status disparity eventually broke up, but the old man finally because of pining for the girl finally fell ill, the boy had to beg the girl hope that she can go home to see the old man, the girl did not listen to her! At this time the boy inquired about the girl singing place, he told the old man, the old man struggled to go to see his daughter one last time, unexpectedly walking on the road a truck flew over, looked at the old man hit, the old dog wangcai fiercely arching to the old man, wangcai just like this death, the boy knew that after the girl decided to write the last song for the girl, he rushed all night long, the top of the long-standing poverty and longing for the time in his body can not be written down the song, let someone give the girl to the girl, and the boy was not able to write a song, but to write a song.

"What a familiar voice,

How many years of wind and rain have accompanied me,

Never need to remember,

Never forget.

Without heaven there is earth,

Without earth there is home,

Without home there is you,

Without you there is me,

If you hadn't raised me,

Given me a warm life,

If you hadn't protected me,

What would have been my fate!

It was you who raised me,

who accompanied me in my first words,

It was you who gave me a home,

which I share with you,

although you can't speak a word,

you understand more about the world's black and white, the true and the false,

although you can't express your true feelings,

but you have given a passionate life to the cause of the world.

What a familiar voice you have in the distance,

Reminds me of your kind heart,

When will you come back to me,

Let me sing with you,

Wine and wine,

Wine and wine,

Wine and wine,

Wine and wine,......

The events of years ago came back to her, the piles of empty bottles, her deaf father fainting from exhaustion on the streets in the heat of the summer to buy a bag of pine nuts for her, and the dog Wangcai dragging his tail and playing with her! The girl cried, her conscience finally clearing, guilty, sad and upset! She learned the song over and over again, and when she finally went on stage, she informed the band to add the last song, "Wine Dry If Sold Without", and the girl sang it, and all the people on the stage were shocked, and all of them shed tears, and the girl told all the people on the stage about her own life, and then ran to the hospital without thinking about anything else, she wanted to see her own father, and when the old man saw his daughter, a line of tears slowly flowed from his cheeks, and the old man could not speak, but just smiled and looked at her, and she said, "I'm sorry. Can't say anything, just smile at his daughter, slowly closed his eyes, the girl's heartbreaking cry, sobbing. This is the "wine dry if sold without", all good filial piety first! Anyone needs.