副詞 on board:

1. on a ship, train, plane or other vehicle
   同義詞：aboard, onboard

1. Be meals serve on board?
   機上有餐飲供應嗎？
2. Many of the tourists on board had begun bargaining with the tradesman.
   船上的很多旅客開始與商人討價還價了。
3. The hijackers kept the pilot on board the plane as (a) hostage.
   劫機者把飛機駕駛員扣留在飛機上作為人質(zhì)。
4. We went on board Athens yesterday morning.
   我們昨天早晨登上雅典號。