1. Imitation, learning knowledge, acquiring knowledge, reading: ~ Health. ~ ACTS. ~ study. ~ industry. ~ friends. ~ that man. ~ valve. ~ system. ~ calendar. ~ Walking in Handan (mocking people who only know imitation, are not good at learning and have no achievements, also called "Handan toddler").

2. Place to impart knowledge: ~ school (referred to as "learning" or "school"). ~ hospital. ~ fu. Medium. Big ~. Go ~.

3. Mastered knowledge: ~ Q (referred to as "learning"). ~ technology (the floorboard of all knowledge). ~ bit. ~ Bachelor (A. Name of degree, graduated from university; B. ancient official names). Only ~. Cure ~. ~ knowledge. Rich and versatile.

4. Different kinds of system knowledge: ~ said. Zhe ~ count. Xiao ~ (1) refers to literature, phonology and exegesis in ancient times; B.now it refers to primary school).