主科

主科	zhǔ kē	required courses in the major subject
主	zhǔ	owner / master / host / individual or party concerned / God / Lord / main / to indicate or signify / trump card (in card games)
科	kē	branch of study / administrative section / division / field / branch / stage directions / family (taxonomy) / rules / laws / to mete out (punishment) / to levy (taxes etc) / to fine sb / CL:个