acoustic unit boundary的用法和样例：
- Whether the metal grid supporting the acoustic units is concealed or exposed and numerous other conditions.
- Compared to supersequence boundaries, the depositional hiatus at sequence boundaries is shorter and sequence boundaries are not compatible with lithostratigraphic unit boundaries.
- When domain boundaries are based upon business unit boundaries rather than geographic boundaries, it can be common for the distribution of domains and SDLs to overlap significantly.
- The luminous intensity on unit area.