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奶只不过是过滤过的血

Milk Is Just Filtered Blood

嗨 欢迎来到分钟地球 我是艾米莉
Hi, this is Emily from MinuteEarth.
近年来超市里有很多种奶可供选择
Supermarkets have lots of milks to choose from these days,
大多是用多种坚果和果核榨汁混合而成
many of which are the product of blending up and straining various nuts and seeds.
但另一方面 普通牛奶
Plain old milk milk, on the other hand,
普通牛奶也是过滤过的 由奶牛的血过滤而成
is also a strained product – it’s filtered cow blood.
虽然听起来很奇怪 但所有哺乳动物的奶都是源自于血液
As weird as that seems, all mammal milk is made from blood,
因为血里面包含了很多营养物质
because blood contains lots of nutrients,
哺乳动物幼体的身体和大脑发育
and baby mammals need lots of sugar, fat, and protein
需要大量的糖 脂肪 蛋白质等
to grow complex brains and bodies.
但妈妈们又不能直接割开动脉
But mammal mammas can’t just open an artery;
因为这样太危险了
that would be dangerous.
再说 血液里的营养物质过于稀薄
Plus, most of the useful nutrients in blood are too dilute
小宝宝也无法处理和吸收血液中过量的铁
and blood has too much iron for most babies to process.
这时候乳腺就发挥作用了
This is where the mammary gland comes in.
乳腺里有上千个囊
It’s full of thousands of tiny sacs whose
囊壁上有特殊的细胞
walls have special cells that grab water and nutrients
它们能从流动的血液中汲取水和营养物 通过化学加工 再传到囊里
from passing blood, do some chemistry on them, and pass them to the inside of the sacs,
混合在一起形成奶
where they mix together to become milk.
宝宝们在喝奶的时候
When a baby starts to suckle on the teat,
吮吸乳头这个动作就告诉妈妈的大脑里的荷尔蒙
its sucking pattern tells the mom ’ s brain
释放粘在囊上的催产素
to the hormone release oxytocin, which attaches to the sacs,
然后挤出牛奶滴到宝宝的嘴里
causing them to squeeze out the tiny droplets of milk into the baby’s mouth.
不同的哺乳动物种类都会根据自己的宝宝调整血液过滤过程
Each mammal species tailors its blood-filtering recipe to the needs of its babies.
比如说 为了使住在北极的小海豹存储足够的脂肪
For example, to help their Arctic-dwelling pups pack on the blubber,
冠海豹妈妈奶的脂肪含量是奶牛的15倍
hooded seal moms produce a milk with 15 times the fat of cow milk.
白尾灰兔妈妈会产高蛋白奶给兔宝宝
Cottontail moms make high-protein milk for their bunny babies,
帮助他们锻炼强健的跳跃肌肉
allowing them to develop their hopping muscles quickly.
塔玛尔小袋鼠的两个乳头 能同时产两种不同的奶
The tammar wallaby can make two different types of milk in two different teats at the same time.
一个富含糖分给袋子里的新生儿
One high in sugars for a newborn in the pouch
另一个富含脂肪和蛋白质给幼年袋鼠
and one high in fat and protein for her waddler.
有选择性的饲养供给乳制品的奶牛不需要特定的奇怪的配方
And while selectively bred modern dairy cows don’t have a particularly wacky recipe for their milk,
无论如何它们都会产出大量的牛奶
they sure make a lot of it.
目前记录的保持者 一个叫作Aftershock的荷斯坦牛
The current record holder – a Holstein named Aftershock –
每天能产一整缸的牛奶
can produce a bathtub full of milk every day.
这足以让人印象深刻
That’s udderly impressive.
本视频是由Honey独家赞助
This video is sponsored by Honey,
Honey是一个可以帮你在网上购物时省钱的免费的浏览器插件
a free browser extension that looks for ways to save you money whenever you shop online.
你只要进入joinhoney.com/minuteearth
You can install Honey with just two clicks
双击鼠标就能安装Honey
of the mouse by going to joinhoney.com/minuteearth.
之后 当你在网上商店结账的时候
After that, any time you go through the checkout process
Hoeny会自动应用最好的优惠 给您找到最大的折扣
at an online store, Honey will automatically apply the best coupon code, it can find to give you the biggest discount.
上周“极小地球”团队通过波普尔实验室
Last week, the MinuteEarth team saved seven bucks
神奇的宇宙探索记录节省了
on this amazing chart of cosmic exploration
7美元
from PopChartLab.
而且Honey不会卖出你的个人信息用以营利
And Honey doesn ’ t make money by selling your personal data; instead,
相反 它会从商家处收取手续费提供给顾客
it collects a small commission from some merchants for bringingthem customers.
请进入joinhoney.com/minuteearth链接
To join the nine million other people using Honey to save money online –
支持我们的频道
and to support
并和9百万的网友一起用Honey来省钱
our channel – go to joinhoney.com/minuteearth.

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视频概述

本视频介绍了牛奶是由奶牛的血过滤而成,举了几个动物的例子,最后介绍了一个可以省钱的插件

听录译者

收集自网络

翻译译者

ID385818

审核员

审核员 RN

视频来源

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

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