1, substitution is a Chinese word, pronounced zh √ Juan, which means to replace or refer to one element instead of other elements in a compound. Used in chemistry, business and mathematics.

2. The official interpretation of replacement is replacement, which refers to replacing one element with another in a complex. It is widely used in chemistry, business and mathematical science. In real life, it is often used. For example, some money can be used to replace new cars that are not used. Small items include home appliance replacement, and large items include land replacement and housing replacement.