keelson board

例句：

1. 1. The keelson board is the main support of the boat.
   船体板是船的主要支撑。
2. 2.The keelson board is made of wood and can be easily replaced.
   船体板由木头制成，可以很容易地更换。
3. 3. The keelson board is designed to provide stability and strength to the boat.
   船体板设计用来提供稳定性和强度给船。