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I'm so glad you're having such a great time at my beach house, Jessi!
杰西，我真高兴你在我的海滨别墅玩得这么开心！
We sure are, Dr. Turtleman! And thanks for house-swapping with me and Squeaks for the weekend!
我们确实玩的很开心，乌龟博士！谢谢你周末和我还有吱吱交换房子！
This was such a great idea!
这真是个好主意！
We get to relax in the sun, and we get to learn all about animals that live in the ocean!
我们可以在阳光下放松，我们可以了解所有生活在海洋中的动物！
Don't forget to say hi to the sea turtles for me!
别忘了替我向海龟问好！
I love those guys!
我爱他们！
Sounds good! And thanks for holding down the Fort! Bye!
听起来不错！谢谢你替我照看堡垒！再见！
Oh! Hello! I'm Dr. Lawrence Turtleman!
哦！你好！我是劳伦斯·乌龟博士！
As you just heard, I'm staying here at the fort while Jessi and Squeaks are at the beach.
正如你刚刚听到的，我现在就呆在堡垒里，杰西和吱吱在海滩上。
so I guess that makes me the host of SciShow Kids this week!
所以我想我就做本周《少儿科学趣味秀》的主持人吧！
And you're in luck, because not only am I a turtle, I am also the foremost expert on turtle facts!
你很幸运，因为我不仅是一只乌龟，我还是研究乌龟最优秀的专家！
So let's dive in!
那么就让我们一探究竟吧！
Did you know there are over 200 types of turtle?
你知道世界上共有200多种海龟吗？
They come in all sorts of shapes and sizes and colors!
它们有各种各样的形状、大小和颜色！
They can have big domed shells with neat patterns, like the eastern box turtle.
乌龟会有带有整齐图案的大圆顶壳，比如东方箱龟。
Or, like the flatback sea turtle, they can have shells with, you guessed it, flat backs.
或者，就像平背海龟一样，会有，你猜猜是什么，平背壳。
Some turtles are enormous!
有些海龟体型巨大！
For instance, the leatherback sea turtle can grow to up to 2 meters long, which is longer than I am tall!
例如，棱皮龟可以长到2米长，比我还高！
They can also weigh up to 900 kilograms, which is about as much as a very big cow, and swim as deep as 1200 meters underwater.
重量可达900公斤，相当于一头大奶牛的重量，可以游到水下1200米深。
It's actually the largest living reptile.
棱皮龟是现存最大的爬行动物。
Those are the animals with scaly skin, like lizards, snakes, crocodiles, and turtles.
这些是有鳞皮的动物，如蜥蜴、蛇、鳄鱼和海龟。
Whereas the speckled padloper tortoise is teeny-tiny, at only about 8 centimeters long!
而有点斑点的鹦嘴龟却很小，只有8厘米长！
But what is a tortoise, anyway?
但是乌龟到底是什么呢？
Well, a tortoise is a type of turtle, but when most people say "tortoise" they mean a turtle that spends its whole life living on land.
乌龟是龟类的一种，但大部分人提到“乌龟”时，通常是指一生都生活在陆地上的陆龟。
And when we say "turtle", we usually mean the kind of turtle that spends at least some of its time in water.
当我们说“龟”时，我们通常指的是那种至少在水中生活了一段时间的海龟。
Not a tortoise.
不是同一种乌龟。
So if we're looking at a turtle, how do we know if it's the tortoise sort of turtle?
所以如果我们看海龟，我们怎么知道它是不是陆龟呢？
Well, you can look at the feet!
你可以看乌龟的脚！
Tortoises have what we call columnar feet, which means they're built like a cylinder, or a column.
陆龟有柱状足，也就是我们所说的圆柱形足，也就是说它们像圆柱体，或者柱体一样。
Sort of like an elephant foot!
有点像大象的脚！
But turtles that spend time in the water have webbed feet to help them swim.
但是在水中生活的海龟有蹼足来帮助它们游泳。
And sea turtles, which spend almost their whole lives in the water, have flippers!
海龟几乎一辈子都生活在水里，它们也有鳍。
Many turtles have a flat shell that helps them move through the water more easily through the water.
许多海龟有一个扁平的壳，这个壳能帮助它们在水中更容易地移动。
But tortoises, who spend their lives on land, have big, hard, dome-shaped shells that make it harder for other animals to eat them.
但是在陆地上生活的陆龟有巨大的、坚硬的、圆顶状的壳，这使得其他动物难以吃掉它们。
Tortoises can live to be extremely old, sometimes well over 100 years!
乌龟可以活到很老，有时候活到100岁以上！
In fact, the oldest animal living on land right now happens to be a very good friend of mine.
事实上，现在生活在陆地上最古老的动物碰巧是我的一个好朋友。
He's a tortoise named Jonathan, and he lives on the island of St. Helena.
他是一只名叫乔纳森的乌龟，住在圣赫勒拿岛。
Scientists think he might be 185 years old!
科学家们认为乔纳森可能已经185岁了！
That's way older than the oldest living human.
这比现存最古老的人类要老得多。
Turtles can come in so many different forms that you can find them all over the world, in almost every kind of weather!
海龟有很多不同的形态，你可以在世界各地各种各样的气候中找到它们！
Remember those giant leatherback sea turtles?
还记得那些巨大的棱皮海龟吗？
They can live in colder waters than most sea turtles,
它们比大多数海龟生活在更冷的水域，
so you’ll find them closer to the North and South poles than any other turtles.
所以你会发现它们比任何其他海龟更靠近北极和南极。
Turtles really get around!
海龟真的遍布各处！
About 50 years ago, a pair of Russian tortoises were even sent up to space, and became some of the first living animals to go around the moon!
大约50年前，一对俄罗斯龟甚至被送上了太空，并成为第一批到达月球的动物！
They survived the trip and went back to their usual lives.
他们在旅途中幸存下来，并回归到了平常的生活。
So turtles are pretty hardy!
所以海龟很强壮！
No wonder they've been around since before the dinosaurs.
难怪它们在恐龙出现之前就存在了。
But they need our help to survive.
但他们需要我们的帮助才能生存。
Fishing, pollution, and other ways humans affect the places where turtles live can hurt them.
渔业、污染和其他人类影响海龟生活的地方会对它们造成伤害。
That's why people are working to help keep turtles safe, by doing things like hanging lights from their fishing nets,
这就是为什么人们为了保护海龟的安全而工作的原因，比如会在渔网上悬挂灯之类的行为。
so turtles can avoid the nets, instead of getting tangled up in them.
这才海龟才能避开渔网，而不是被渔网缠住。
And what about turtles living with humans?
那么与人类生活在一起的海龟呢？
Well, keeping a turtle around can be a lot of work!
养一只海龟可是一项艰巨的任务！
For one thing, turtles can be really messy.
首先，海龟会很邋遢。
I mean, I try to remember to put my turtle toys away and wash my turtle dishes, but sometimes I forget!
我是说，我试着记得把我的海龟玩具收起来，洗我的海龟盘，但有时我忘记了！
Some types of turtles can grow to be really big, and they'll need lots of space to swim and walk around，
某些类型的海龟能长到很大，他们会需要大量的空间来游泳、散步。
and even more space as they grow bigger.
乌龟越长越大，所需空间也越来越大。
And since turtles live so long, you're going to be responsible for it for a long time.
由于海龟的寿命很长，你要对它负责很长一段时间。
But if you really, really want a turtle at home, the best way to get one is to adopt one from a local shelter, not out from the wild.
但是如果你真的非常想在家里养一只海龟，最好的办法就是从当地的收容所领养一只，而不是抓一只野生的。
Some turtles can carry diseases that can make them dangerous to people.
某些海龟能携带对人类造成威胁的疾病。
And a lot of turtles are pretty unfriendly.
大部分海龟都很不友好。
It's much safer for you, and the turtle to keep a turtle that's used to living near people.
养一只以前住在人类附近的海龟，这对你来说是更安全的，对乌龟也是。
That way, you can make sure you give it everything it needs to stay happy.
这样，你就能确保你给了它保持快乐所需要的一切。
And who doesn't love a happy turtle?
谁不喜欢快乐的海龟呢？
I know I do!
我知道我就喜欢！
Thanks for joining me!
感谢您的收看！
If you want to keep learning and having fun here at the Fort, hit the subscribe button,
如果你想继续学习，与我和吱吱共度美好时光，就点击订阅吧，
and don't forget to check us out on the YouTube Kids app.
不要忘了在YouTube Kids应用上查看我们。
We'll see you next time!
我们下期见！
