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人们在探索世界的奥妙、研究实际问题时,会遇到各种各样的量,其中有的量在所研究的过程中保持不变,有的量在所研究的过程中可取不同的数值;前者叫常量,后者叫变量.
When people explore the mysteries of the world and study practical problems, they will encounter various kinds of quantities. Some of them will remain unchanged in the course of research, and some may take different values in the process of research. The former is called a constant and the latter is called a variable.