2 sentences

1. 潜艇的推进器在水下发出的噪音很小。

   qián​tǐng de tuī​jìn​qì zài shuǐ​xià fā​chū de zào​yīn hěn xiǎo.

   The submarine's thrusters make very little noise underwater.

   Source: Dong Chinese Dictionary

2. 卫星利用小型推进器来调整其运行轨道。

   wèi​xīng lì​yòng xiǎo​xíng tuī​jìn​qì lái tiáo​zhěng qí yùn​xíng guǐ​dào.

   Satellites use small thrusters to adjust their orbits.

   Source: Dong Chinese Dictionary