The formidable Viking longship had its origins in the humble dugout canoe, or log boat.

强大的维京长船起源于简陋的独木舟。

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

船底不再是独木舟基底，而是改用龙骨板，船变得更高，且更适合航海。

But these early ships retained the concept of the original log boat: their strength depended on the outer shell of wood, not internal frames and beams.

船的强度取决于外壳木材，而不是内部框架和梁。