ducted-fan engine

例句：

1. 1. The new ducted fan engine significantly improves the efficiency of our heating system.
   新型导管风扇发动机大大提高了我们供暖系统的效率。
2. 2.The ducted fan engine is a popular choice for high-rise buildings due to its quiet operation and energy-saving features.
   导管风扇发动机因其静音运行和节能特性而成为高层建筑的热门选择。
3. 3.In recent years, there has been a growing demand for high-efficiency ducted fan engines in various industries.
   近年来，各行业对高效能导管风扇发动机的需求不断增长。