navigable period

例句：

1. 1. The navigable period for this project is from January to March.
   这个项目的可航行时期是从一月到三月。
2. 2.During the navigable period, we can travel to different countries without a visa.
   在可航行时期，我们可以无需签证前往不同国家。
3. 3.The navigable period for ships is typically between 60 and 90 days.
   船只的可航行期通常为60到90天。