ducted rocket

例句：

1. 1. The engineer designed a ducted fan to improve airflow in the room.
   工程师设计了一个导管风扇，以改善房间内的气流。
2. 2.The new technology uses ducted heating systems to provide efficient and even heat distribution.
   新技术使用导管加热系统来提供高效和均匀的热量分布。
3. 3. The ducted system is designed to minimize noise and vibration during operation.
   导管系统被设计成在运行过程中最小化噪音和振动。