Introduction to Oil Chexia: After walking through the school, you will see a larger and taller house, commonly known as "Youchaxia". Although it is two stories high, it is not stratified. Although it has three rooms width, but no divisions. When you walk into the gate, you will see an upright water wheel about three meters high and a flat millstone about three meters large. The rotating connection between them is a wooden pot wheel, and their rotating axes are two huge logs. There is an oil truck lying on the right side. Two huge logs are hollowed out in the center, oil tea cakes are stuffed in, squeezed in with inclined wooden blocks, squeezed hard, and the oil is pressed using local methods. This is the most primitive oil truck. On the high beam, two ropes were hung, and a huge log was hung on the rope. An iron block was installed on the top of the log, a sloping wooden block used for impacting oil, commonly known as an oil stick. When winter comes, the villagers divert water from the upper reaches of the creek. The water wheels here start to rotate, and the millstones also start to rotate. The black camellia seeds turn into powder. After being steamed, they are tripped with straw into tea seed cakes and stuffed into the oil truck. More than a dozen people pushed the oil stick, and the whole space heard a "hey ha" sound. At the same time, golden tea oil flowed out from under the oil truck, and the whole space was filled with a special fragrance.