Assertion: turbine's speed | /r/HasProperty | needed
Facets:
Source sentences:
text: Because of their poor thermal efficiency at low power (cruising) output, it is common for ships using them to have diesel engines for cruising, with gas turbines reserved for when higher speeds are needed.
text: In a situation where multiple speeds are needed, a transmission with multiple gears can be used to increase torque while slowing down the output speed.