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袋鼠的袋里有什么 – 译学馆
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袋鼠的袋里有什么

What’s Inside A Kangaroo’s Pouch?

乍一看 袋鼠的口袋
At first glance, a kangaroo’s pouch
就是一个内置的婴儿吊带
looks like nothing buta built-in baby sling.
但如果偷看一下育儿袋
But if you peeked inside,
你会发现它远比普通口袋复杂的多
you’d see it’s far more complex than a simple pocket.
袋鼠的口袋不得不进化成这样
It has to be, because the joey inside
因为袋内的小袋鼠不像一般的婴儿
is not your average baby.
一只成年雄红袋鼠可以达到
An adult male red kangaroo can stand over
1.5米高 90千克重
1 1/2 meters tall and weigh 90 kilograms.
比一个成年男子还要高大
That’s larger than a grown man.
但是刚出生的小袋鼠只有糖豆大小
But the newborns start outthe size of jelly beans.
它们既看不见也听不见 还光秃秃没有毛
They’re blind, deaf, and hairless to boot.
毕竟 它们出生前
After all, they only spend 33 days
只在母亲体内呆了33天
inside their mom before birth.
这就好比一个人类妈妈怀孕两个月就把孩子生出来
That’s like a human having a baby when she’s two months pregnant.
所以 未发育完全的小袋鼠还没准备好
So the underdevelopedroo isn’t ready to face
面对严酷的澳大利亚野生环境
the harsh Australian wilderness.
这时候袋鼠的口袋就有用了
That’s where the pouch comes in.
这个皮肤做的口袋就像第二子宫
It’s a pocket of skin thatacts like a second womb,
给了小袋鼠安全舒适的成长环境
giving the joey a safe,cozy environment to grow. And,
就像怀孕的肚子一样
like a pregnant belly,
袋鼠育儿袋可以随着幼崽的长大而变大
the pouch can stretch to fit the baby as it gets bigger.
袋子由有力而灵活的肌肉和韧带构成
It’s lined with powerful, but flexible, muscles and ligaments.
为保证幼崽的安全 袋鼠妈妈会绷紧肌肉
To keep the joey safe, momcan tighten those muscles
让袋子裹紧小袋鼠
to shut the pouch flush against her body,
就像拉紧束口袋的绳子一样
just like pulling a drawstring bag closed.
不过它也要额外的空间
And it will need the extra space,
因为在接下来的八个月中
because over the course of eight months,
豆子大小的幼崽将逐渐长大
that bean-sized baby will reach the size
达到家猫大小
of a large house cat.
变为它出生时体重的几千倍
That’s thousands oftimes its birth weight.
如此飞速的成长得益于袋内的4个乳头
That rapid growth is thanksto the pouch’s four nipples,
这些乳头可以产出含有抗菌抗体的奶水
which spout milk that containsgerm-fighting antibodies
以此避免小袋鼠生病
to keep the little roo from getting sick.
但这仅仅是个开始
But that’s just the start.
要知道 奶水中的营养成分
You see, the nutrient levels change
会随着幼崽成长阶段的不同需求发生改变
to meet the baby’s needs as it ages.
例如 头发的主要成分硫
For example, sulfur, a majorbuilding block of hair,
会在三个月左右达到峰值
peaks around three months in.
这和幼崽开始长毛的时间相吻合
That’s the same time thebaby starts growing fur.
最棒的功能是什么?
The best part?
袋鼠妈妈可以同时产出多种类型的奶水
Mom can produce multiple typesof milk at the same time,
并将它们从相应的乳头中喷出来
each squirting from its own nipple.
这样她就可以同时哺育两个不同年龄段的幼崽
So she can suckle two babies in different age groups simultaneously.
袋鼠育儿袋的另一个特点在于
Another special featureabout the kangaroo pouch
它的内部遍布汗腺
is that it’s lined with sweat glands
这些汗腺会释放抗菌物质
that release antimicrobial substances,
有助于保护小袋鼠
which help protect the baby roos
免受病毒 细菌和寄生虫的侵害
from harmful viruses,bacteria, and parasites.
同时 育儿袋的设计还有另一个
But there’s one moreway that pouch’s design
保证小袋鼠安全的用途
keeps the joey safe.
育儿袋完全无毛 所以皮肤间的直接接触
It’s totally hairless, andthat skin-to-skin contact
可以保证幼崽的温暖舒适
keeps the baby warm and cozy. Basically,
因此 这基本上是一个顶级育儿所
it’s the ultimate nursery.
但没有什么是永恒的
But nothing lasts forever. Eventually,
终有一天 小袋鼠得离开育儿袋
the joey willneed to leave the pouch.
5个月左右时 它会把头伸出育儿袋
At about 5 months old,it pokes its head out.
再过一个月 它会向世界
And a month later, ittakes its first tentative
跨出试探性的第一步
steps into the world. There,
随后 它将探索几秒钟
it will explorefor a few short seconds
然后调头钻回育儿袋
before high-tailing it home.
但随着它长大 胆子变大 它也将在外越待越久
But as it gets older andbolder, it stays out longer,
直到八个月后
until eight months in:
它就可以完全离开育婴袋了
It’s ready to leave the nest, well, the pouch, for good.

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视频概述

袋鼠作为最典型的有袋动物,靠一个大袋子养大孩子。这样神奇的育儿袋里究竟有些什么呢?

听录译者

收集自网络

翻译译者

傻奶糕瀚宇Kido

审核员

审核员BZ

视频来源

https://www.youtube.com/watch?v=CmTovo7kyIM

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