1. Twenty centimeters are equal to two decimeters. 2. The term "centimeter" is commonly used to refer to length, and is interchangeable with "decimeter." 3. One centimeter is equivalent to one decimeter, thus twenty centimeters are equal to two decimeters. 4. In formal documentation, the term "centimeter" is now used instead of "decimeter" due to its outdated connotation. 5. In ancient Chinese market units of measurement, when Western units were introduced, the "公" (public/general) prefix was added to distinguish them. 6. For instance, "公尺" (meter), "公分" (centimeter), "公厘" (millimeter) were eventually standardized to the metric system's meters, centimeters, millimeters respectively. 7. In written and academic expressions, the term "centimeter" is typically used, while in engineering and other fields, the habit of using "decimeter" may persist. 8. The abbreviation for "decimeter" is the same as "centimeter," written as "cm," indicating that one decimeter is equal to one centimeter. 9. There is no substantial difference between "decimeters" and "centimeters," they are just referred to differently based on habit. 10. In daily communication, people may directly say "1 deci" or "1 centi," but in practice, they represent the same value.