What makes iron better than bronze
铁跟青铜相比 其优势在于
is it holds an edge better.
能更好地稳固船边
If you're trying to work with wood,
如果你是用木头工作
the ability to keep a sharp edge meant
如果想将船边牢固
you could make thin planks,
就要用很厚的木板
you could shape beams, you could build better ships.
如果能制造船梁 就能造成理想的大船
Iron tools revolutionize shipbuilding
铁具给造船业带来了新的春天
And allow mankind to innovate as never before.
也让人类发生了翻天覆地的变化
A revolutionary invention:
龙骨的诞生
The keel.
是一项具有划时代意义的发明
Now ships can remain stable in the roughest waters,
现在船可以在恶劣的海洋环境中航行
The key to mankind's future at sea.
而主宰人类未来的关键正是航海
Hanno has sailed from the Mediterranean
汉诺从地中海出发
Into uncharted waters: the Atlantic Ocean.
驶向未知的大西洋海域
With 30,000 colonists,
同三万名殖民地开拓者一道
He's looking for new lands, new opportunities.
他在找寻新的大陆 新的契机
For some of these early explorers,
这些开拓者中的一部分人
all they've been told
他们知道的只是
is that the world drops off.
陆地被分成很多部分
It's a step into the unknown, it's huge.
这就像踏上了未知的旅途 意义重大