geared-down engine

例句：

1. 1. The new car has a geared-down engine that saves fuel and reduces emissions.
   这款新车配备了一个减配发动机，既节省燃油又减少排放。
2. 2.The old car's geared-down engine was no longer able to handle the heavy traffic.
   旧车的减配发动机已经无法应对繁忙的交通了。
3. 3.The engineer replaced the geared-down engine with a more powerful one to improve performance.
   工程师将减配发动机更换为更强大的一款，以提升性能。