추진propulsion; pushing; driving 후진국underdeveloped country; less developed country 선진being advanced 선진국advanced country; developed country 직진straight movement 진로course 진출expansion 진학entrance to a higher education institution 진행progress 진행자host; emcee

초급elementary level; beginning stage 초급반beginner's class 최고급the highest grade; top-level 특급special class; special rank; special grade 하급생junior student; underclassman 고급high quality; high grade 고급반class for advanced learners; the highest-level class 고급품high-end product 고급화enhancement 상급반upper grades; higher grades