## 例文

- The constant 1 denotes the absence of any resource, and
*so functions*as the unit of ?". - The differential of a constant function is zero, as noted above, and the differential operator is a linear operator,
*so functions*that only differ by a constant term have the same derivative. - In these cases responsibility-driven design may be promoted as a better approach, where functionality and data can be coupled together,
*so functions*don't have to deal with the data representation itself.