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英语煎蛋小学堂视频百科113:大白鲨的10个真相(MP3+中英双语)

cocotang 于2015-06-26发布 l 已有人浏览
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英语视频:煎蛋小学堂113:大白鲨的10个真相,以幽默诙谐的方式为你解答那些那些你意想不到的科学小知识,含有中英双语字幕视频,mp3下载。
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Here are some facts about great white sharks:white sharks are live-birthed,usually in litters of between four and seven individuals.Now they're called pups,but when they're born they're between 1.2 and 1.5 meters! So that's a pretty big baby.

现在我们来说几条关于大白鲨的真相:大白鲨是胎生动物 每一窝大概4-7只小鲨,尽管它们还是幼崽,但其出生时身体长达1.2-1.5米!好大一个崽子。

It takes a great white shark about ten to twelve years to reach maturity at which point the females are actually about a meter longer than the males the largest recorded being over six meters roughly the size of this red boat behind me.At this length they'd weigh about two to three thousand kilograms.Oh man!Now there are stories of some great whites being over seven meters but those are unsubstantiated.

大白鲨需要10-12年才能发育成熟 此时 雌鲨要比雄鲨长处大约一米 世界最长记录是6米多 大概和我身后这条红船一样长。长到这么长时 它们体重大约在2-3吨。我勒个去!外界甚至有关于长达7米的大白鲨的传闻 但这些都未被证实。

White sharks are warm bodied.they're not warm-blooded like us:they can't maintain a perfectly stable temperature,but their internal organs are kept at up to thirteen degrees above the average temperature of the ambient water around them.The heat generated by their muscles is actually transferred to the blood in their veins as it returns from the shark's extremities,so it warms it up and keeps the core temperature a little bit hotter.

大白鲨是温体动物。它们并非人类这样的恒温动物;它们不能保持完全恒定的体温,不过其体内器官能保持在比周围海水 平均温度高出至多13度的温度。它们肌肉产生的热量会在血液从四肢回流时 传回血管里的血液内,它们以此保持温暖 并让体核温度稍微高些。

This allows the shark to venture into colder waters and also to have explosive power.Its muscles work a lot better when warm than when cold,just like ours.The tradeoff is the shark requires about ten times as much energy as if it didn't heat its body and that's why they need to feed on these blubber rich seals and whale carcasses.

这也让它们得以在冷水中横行霸道 并保持足够的爆发力。它们的肌肉在温暖时比冰冷时更有力 这点与我们一样。相较而言 鲨鱼在身体冰冷时需要的能量 是平常的10倍 这就是为什么它们得以富含脂肪的海豹和鲸鱼尸体为食.

White sharks like to hunt when it's light out because they use their eyesight to spot their prey.but when they open their jaws,their eyes actually roll back into their head to protect them and so they're actually blind when they're taking a bite.Now they do like conditions that are a little low visibility.consider they rely on stealth to track down their prey.

大白鲨喜欢在亮处捕猎 它们用敏锐的眼光来盯准猎物。但在张口时 它们的眼睛却缩回到了脑内 来保护自己 所以在咬猎物时它们什么也看不见。不过的确它们喜欢能见度略低的环境 因为它们靠近猎物前得隐蔽自己。

IF a seal spots them coming,it's basically game over because the seal is so much more maneuverable and it can definitely get away from the shark.But they only eat sea mammals after they're about 2.5 meters long.which is why most of the sharks we're seeing around here are quite large.Before that,they're diet consists mainly of fish.

如果海豹发现它们 捕猎就玩完了 因为海豹的灵活性更好 它们肯定能躲开大白鲨。鲨鱼在体长达2.5米之后只吃海洋哺乳动物。这就是为什么我们在这看到的大部分鲨鱼都很大。在此之前 它们主要吃鱼。

The gestation period is thought to be about eighteen months and that leads to a two to three year reproduction cycle and with such small litters that means it takes a long time for this shark population to recover.There are a couple misconceptions about great white sharks.One is that can't get cancer and that's led to a lot of people hunting them down and trying to use their fins as an anti-cancer soup.

大白鲨孕期大约在18个月左右 因此 它们的繁殖周期约有2-3年 而其每窝幼崽数量较少 因此大白鲨恢复原先数量的时间很长。这有几条关于大白鲨的误解。一个是它们不会的癌症 这也催使许多人捕杀它们 并想用它们的鱼翅做防癌鲜汤。

But in reality sharks get cancer just like anything else and there is photographic evidence of sharks with big tumors so it makes no sense to hunt down sharks as a cancer remedy because they get cancer just like we do.

而实际上 同其他生物一样 大白鲨也会患癌 这有一张有巨大肿瘤的大白鲨照片 把鲨鱼当成抗癌药而捕猎它们真的毫无意义 因为它们和我们一样 也会患癌。

Another misconception is sharks are coastal creatures that just cruise the beaches waiting to bite people.In reality the sharks spend much of their time way,way out at sea and very deep,over a kilometer deep.It's kind of shocking but we've only found this out in the last couple of years so there is so much about sharks that remains undiscovered.

另一则是 大白鲨是沿海生活的动物 它们在海滩边游弋 伺机攻击人类。而实际鲨鱼大部分时间都在离岸很远的海中 深至一千米的地方。这很让人惊讶 但我们在前几年才发现这点 因此 大白鲨没被发现的事实还有很多。

We don't know where they go or what they do for most of the time that they're alive.That's why research projects like this are so important to find out more about the shark and figure out how we can help it rehabilitate and become the predator of the sea that it once was.

我们尚不知它们的去向 以及其一生内的主要活动。这就是这类研究项目的重要意义 了解更多大白鲨的真相 帮助大白鲨种群恢复原状 让它们重归昔日海中霸主的地位。

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