a rostral crown的用法和样例：
- The statue stands on a rostral pedestal of gray marble representing the prow of a ship, and figures the goddess as she descended from the skies to the triumphant fleet.
- The leadership watched from high above, on a rostrum in front of the Forbidden City, from which Chinese emperors used to hand down edicts.
- A major has a crown on the shoulder of his uniform.
- There is a vein of melancholy in his character.
- There was a long lag in forwarding mail to us.