Are car options installed at the factory or at the 4S store?

[StBrynlee]

Car options are installed at the factory. The following is an introduction to engine-related content: 1. Energy conversion: An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, an internal combustion engine usually converts chemical energy into mechanical energy. 2. Device: The engine is suitable for both power generation devices and can also refer to the entire machine including the power device (such as: gasoline engine, aircraft engine). The engine was first born in the UK, so the concept of the engine also comes from English, and its original meaning refers to that kind of "mechanical device that generates power."