This is the 4124th most frequent Chinese word.
变速箱
Transmission.
This sentence employs "变速箱" to refer to a specific component of the car that is responsible for gear shifting.
我的汽车的变速箱需要维修。
My car's gearbox needs repair.
Here, "变速箱" is generalized to indicate advanced engineering technologies associated with vehicle gear systems.
现代的变速箱技术提高了汽车的动力表现。
Modern gearbox technology has enhanced car performance.
In this case, "变速箱" specifies the type of gearbox, i.e., a manual gearbox, within the context of driving expertise.