They abandoned the log boat base for a keel plank, and the boats became higher and more seaworthy.

底不再是独木舟基底，而是改用龙骨板，变得更高，且更适合航海。

But look ye, the only real owner of anything is its commander; and hark ye, my conscience is in this ship's keel.

可是你看着，这艘真正的东就是它的长；你听着，我的良心就是这艘的龙骨。

A replica of the keelboat they used is now on display here in the North Dakota capital of Bismarck.

们使用的龙骨的复制品现在在北州首府俾斯麦展出。

To be successful in your mission, you have to swim under the ship and find the keel — the centerline and the deepest part of the ship.

要想成功完成任务，您必须游到底并找到龙骨——的中心线和最深的部分。