龙骨的诞生

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

重点讲解

1、remain

保持;继续;持续

The three men remained silent.

这3个人保持着沉默。

The situation remains tense.

形势持续紧张。

留在，停留于(某处)

He will have to remain in hospital for at least 10 days.

他至少得在医院里呆10天。

From time to time, James remained at home with his family.

詹姆斯偶尔留在家里陪家人。

仍然存在;继续存在

Many of the differences in everyday life remain.

日常生活中的许多差异仍然存在。

The wider problem remains..

更普遍的问题仍未解决。

残余（物）;剩余（物）;遗迹

They were tidying up the remains of their picnic.

他们正在收拾野餐后剩下的东西。

the charred remains of a tank.

烧焦的坦克残骸

2、drop off

打瞌睡;睡着

I must have dropped off to sleep.

我肯定是睡着了。

Just as I was dropping off, a strange thought crossed my mind.

就在我打瞌睡的时候,一个奇怪的念头闪过我的脑海。

减退;减少

Sales to the British forces are expected to drop off.

预计对英国军队的销售量会减少。

The daily toll of casualties has dropped off sharply.

每日伤亡人数已经大大减少。

3、revolutionary

革命的

Do you know anything about the revolutionary movement?

你了解这场革命运动吗？

the Cuban revolutionary leader, Jose Marti.

古巴革命领导人何塞·马蒂

革命性的;突破性的;发生重大变革的

Invented in 1951, the rotary engine is a revolutionary concept in internal combustion.

1951年发明的转缸式发动机是内燃机领域内的革命性概念。

His playing as a trumpet player was quite revolutionary.

他的小号演奏独创一格。