jiǎn​sù​qì

moderator

减速器 (減速器) jiǎn​sù​qì
moderator noun
a device or substance used to slow down the velocity of particles, such as neutrons in a nuclear reactor
reducer noun
a mechanical device, such as a gearbox, used to decrease the rotational speed of a motor or engine to increase torque

Frequency

Movie subtitles
0.030 per million appears in 0% of films
Written text
0.270 per million

Sources

Definitions
CC-CEDICT