preliminary heating的用法和樣例：
例句
- The heated-air system provides rapid heating of the air entering the carburetor when the engine is cold.
發動機處於冷態時，預熱空氣裝置能迅速提供熱的空氣進入化油器。 - 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.
很多熱量從燃燒室散發出來，直接進入廢棄排氣系統，一部分熱量進入了發動機去預熱發動機。
