进阶 (jìnjié): This term refers to advancing or progressing to a higher level. It implies moving beyond the basic level and acquiring more advanced knowledge or skills.
扎实 (zhāshi): This term means solid or substantial. It describes something that is well-grounded and reliable, just like a strong foundation.
学科 (xuékē): This term refers to an academic discipline or subject of study. It encompasses various fields such as mathematics, science, literature, etc.