zhǔ​gōng

main assault

主攻 zhǔ​gōng
main assault verb
to lead or focus on the primary attack in a military or sporting context

The troops decided to launch their main attack from the north.

specialize verb
to major in a subject or focus one's efforts and research on a specific field

During his graduate studies, he specialized in software engineering and was particularly good at developing mobile applications.

Frequency

Movie subtitles
0.600 per million appears in 0% of films
Written text
4.49 per million

Sources

Definitions
CC-CEDICT