The first meaning is "science". Science refers to the knowledge system that discovers the essence and laws of things through experiments and observations. The Japanese attach great importance to the development of science and technology, so science occupies a very important position in Japanese society. For example, in Japanese universities, there are often many more students majoring in science than other majors.
The second layer means "department" or "department". People who work or live in Japan often use the word department to indicate their department or department. For example, hospitals have cardiology and gastroenterology, universities have physics and chemistry, and companies have R&D and sales.
The third meaning is "category" or "theme". The word "theme" is often used in Japanese schools. For example, primary and junior high schools have Chinese, mathematics, music and other subjects, while high schools and universities have more subjects to choose from.
Generally speaking, the word family has a very wide range of uses in Japanese, and it plays a very important role from science to departments and disciplines.