demonstration engine

例句：

1. 1.The demonstration engine was a great success at the trade show.
   在贸易展上，这个演示引擎取得了巨大成功。
2. 2. The new model car has a demonstration engine that can accelerate from zero to sixty in just three seconds.
   这款新车配备了一个演示引擎，从静止加速到六十公里每小时只需三秒。
3. 3. The engineers used the demonstration engine to test the new design of the aircraft.
   工程师们利用这个演示引擎来测试飞机的新设计。