What does douyin mean?

[Hector]

douyin is an engine, and its principle is: 1. Mix air and gasoline in a certain proportion to form a combustible mixture; 2. The intake stroke draws the mixture into the cylinder, where it is compressed, ignited, and burned to generate thermal energy; 3. The high-temperature and high-pressure gas acts on the top of the piston, pushing the piston to perform reciprocating linear motion, and the mechanical energy is output externally through the connecting rod, crankshaft, and flywheel mechanism. Engine maintenance methods: 1. Use qualified engine oil; 2. Use qualified coolant; 3. Regularly clean the scale in the radiator; 4. Regularly remove carbon deposits from the engine; 5. Replace the air filter, oil filter, and fuel filter on time; 6. Check the condition of the spark plugs; 7. Maintain normal engine speed.