core matter
The Spanish term 'materia troncal' refers to 'core matter' in English. This term is often used in educational contexts, referring to primary or mandatory subjects that act as the foundation or core of a particular curriculum or course of study. It is the primary knowledge or skills that are fundamental to a particular field or discipline. The phrase can also be used more generally to refer to the main or most important part of anything.
The core subject of this course is mathematics.
This sentence indicates that mathematics is a fundamental part of the curriculum for the course.
In school, the core subject also includes social sciences.
This statement emphasizes that social sciences are considered a key subject along with others in the school curriculum.
To graduate, it is necessary to pass all the core subjects.
This phrase highlights the requirement of successfully completing all main subjects in order to receive a diploma.