People who go to primary school after 80s and 9 1 year will learn units such as "size" and "centimeter" in the learning process. These units are commonly used length units, and they are also the basic knowledge that primary school students need to master.
Specifically, "size" is a traditional unit of length in China, and one foot is equal to ten inches, while "centimeter" is an international unit of length, and one centimeter is equal to one tenth of a meter. In the process of learning, students will learn these units in various ways, such as measuring the length of objects around them or consolidating their knowledge by doing exercises.
In addition, these units are also commonly used in daily life. For example, when buying clothes, shoes and other items, the unit of "size" is usually used to describe their sizes. Therefore, people who go to primary school after 80s and 9 1 year will learn these units during their study, and this knowledge will accompany them for life.
Finally, I hope my answer will help you, and I wish you success in your career and all the best!