第一斜桅

例句：

1. 1. The first ship to sail the ocean was a merchant vessel.
   第一个航行海洋的商船是一艘帆船。
2. 2. The captain stood at the bow of the ship, surveying his fleet.
   船长站在船头，巡视着他的舰队。
3. 3. The first mate had been in charge of the ship since it left port.
   大副自从船只离开港口以来一直负责指挥。