address mapping unit的用法和样例：
- Adds an IP address mapping to the NAT interface address pool.
- A surveying and mapping unit shall establish and improve the system of quality control over its surveying and mapping results.
- This can be done by assigning the two processes distinct address map identifiers, or by using process IDs.
- Asurveying and mapping unit shall be liable for compensation for any losses caused to a user or users by its substandard surveying and mapping results.