I want to explain the composition of the coal stove, 600 words, thank you ~

My music box \ r \ n \ r \ nI I have a wooden music box, which has followed me for two years. My father gave it to me on my birthday. \ r \ Music box has a unique appearance. It is the shape of the house. There is a small room with roses and English engraved on the front, and a big windmill stands out on the door of the small room. The windmill is divided into four petals, engraved with roses. As long as the windmill leaves turn left, a beautiful waltz will be played. There is a small platform next to the hut, and there is a wooden duckling with open wings on the platform. It looks at people and has a small red mouth, as if to say, "welcome to the music house!" " At the top of the small platform and cabin, there is a roof supported by a mirror, and the beautiful English word: HAPPYBIRTHDAY is engraved on the side! (Happy birthday! ) \ r \ The music played by the music box is very nice. When it makes a sound, the windmill will turn gently with the music, and the ducklings on the platform will dance in circles with it. Why is this? It turns out that there is a magnet at the bottom of the duckling, and there is also a magnet in the platform, supported by a small stick. People who make music boxes tie sticks with many silk threads and pull the silk threads to the bottom of the music box. There is a disc at the bottom to which the silk thread is tied. At the top of the disc, there is also a pillar that goes straight into the cabin, and the music comes from the cabin. As soon as the music rings, the gears in the room will drive the cylinder to rotate, and the cylinder will drive the disk to rotate, and then the silk thread will drive the stick to rotate through the rotation of the disk. Finally, the magnet will drive the magnet at the bottom of the duckling, and the duckling will turn. \ r \ Whenever I am tired of doing my homework, I will open the music box and listen to beautiful music. The exhaustion and tiredness suddenly vanished, which made me relax and immerse myself in the wonderful music world ... \ r \ nI I like music boxes, and I prefer wonderful music.