preliminary heating的用法和样例：
例句
- The heated-air system provides rapid heating of the air entering the carburetor when the engine is cold.
发动机处于冷态时，预热空气装置能迅速提供热的空气进入化油器。 - A lot of the heat from this combustion goes right out the exhaust system, but some of it soaks into the engine, heating it up.
很多热量从燃烧室散发出来，直接进入废弃排气系统，一部分热量进入了发动机去预热发动机。
