zhǔ​lì​jūn

main force

主力军 (主力軍) zhǔ​lì​jūn
main force noun
the primary fighting force within a military organization

The main forces repelled the enemy's attack on the front line.

mainstay noun
the group or element that has the most impact or plays the most significant role in an activity

Small and medium-sized enterprises are the main driving force of the country's economic development.

Frequency

Movie subtitles
0.060 per million appears in 0% of films
Written text
3.02 per million

Sources

Definitions
CC-CEDICT