navigational mark的用法和样例：
例句
- Of course, he must obey the race rules and try to avoid committing such fouls as hitting the yachting mark.
当然要遵守比赛规则，尽量避免像碰撞航标之类的犯规。 - Urban dominant industry is an important underpinning of regional economic development, and is a navigation mark of regional industry modernization.
摘要区城城市主导产业是区城经济发展的主要支柱，是区域产业现代化的航标。
