totally-enclosed motor

例句：

1. 1. The new car has a totally enclosed motor that provides smooth acceleration.
   这款新车配备了一个完全封闭的电机，提供平稳的加速性能。
2. 2.The old bus had a completely enclosed motor that could run for hours on a single charge.
   旧公交车有一个完全封闭的电机，一次充电可以运行数小时。
3. 3. The new train uses a totally enclosed motor to reduce noise pollution.
   新火车使用完全封闭的电机来减少噪音污染。