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喵星人和汪星人是怎么喝水的 – 译学馆
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喵星人和汪星人是怎么喝水的

How Do Cats and Dogs Drink Water?

你们可能有注意过猫是用舌头卷起牛奶来喝 而狗会
You might have noticed how cats delicately lap up milk, while dogs will head over to
把头伸到碗上方把水溅得满地板都是
a water dish and sloppily splash all over your floor.
事实上 “猫和狗的口水规则” 是有一些有趣的物理理论
Turns out, there’s some interesting physics to back up the phrase, “cats rule and dogs
支持的
drool.”
这是因为猫狗会用舌头来抵抗重力的影响
That’s because these pets have to use their tongues to get liquids into their mouths,
从而喝到水
fighting against the effects of gravity.
根据一些实验研究 我们知道了为什么狗会把水溅出来
And, according to a couple research studies, cats and dogs have slightly different techniques
而猫不会
that do or don’t make a splash.
因为我们会用嘴“吸” 所以我们可以抿一口牛奶或者汤
You and I can sip our milkshakes and soups thanks to suction.
而像马 猪和羊这类动物也可以把水“吸”到嘴里
And animals like horses, pigs, and sheep can suck up their water, too.
这是因为我们拥有完整的面颊 意味着我们有肌肉和组织
And that’s because we all have complete cheeks, which means we have muscles and tissues
来让我们的嘴巴形成一个可以产生吸力的封闭环境
that let us seal our mouths and create a partial vacuum.
主要是你可以在嘴里形成一个比外界气压要低的环境
Basically, you can make a pocket of lower air pressure in your mouth, so the water you’re
然后外界的高气压就会把水“压”进你的嘴里
trying to drink gets pushed up by the higher-pressure outside air.
这就是我们所说的“吸力”
And that’s suction.
但是猫和狗没有像我们这样的面颊
But cats and dogs don’t have cheeks like ours.
像很多肉食性哺乳动物一样 他们的下巴为了能在捕猎时扩张到最大
Like lots of predatory mammals, they have incomplete cheeks, which lets them extend
他们没有完整的面颊
their jaws wider to chomp down on their prey.
所以它们不能像我们在嘴里形成封闭的低压环境来喝水
But they /can’t/ create that partial vacuum and suck up liquid.
相反 它们会用它们灵活有力的舌头把水或者牛奶
Instead, they use their powerful tongues to create columns of liquids like water or milk,
拍卷上来
and lap it up.
在慢速摄影下 不同的科学家小组试图搞懂
Using slow-motion video, different groups of researchers have tried to figure out the
猫和狗舌头动作的物理原理
physics behind the tongue movements of cats and dogs.
一个小组发现 猫只会把舌头轻轻地在水的表面
One study found that cats lower the tips of their tongues to just barely touch the surface
沾一下
of the water.
然后 马上以每秒80厘米的速度缩回舌头
Then, they quickly retract their tongues at speeds of almost 80 centimeters per second.
多亏了水分子之间互相的凝聚力 水就会沾在猫的舌头上
The water molecules stick to the cat’s tongue thanks to adhesive forces, and stick to each
被带到嘴里
other because of cohesive forces.
水在这一瞬间形成了一个圆柱 从而战胜了地球的引力
And this creates a column of water for a split-second, fighting against the force of gravity.
然后在舌头减速回到嘴里后 猫会把嘴闭上不让水流出来 猫吞下水之后继续重复以上动作
Then the cat slows down its tongue, closes its mouth to trap some of the water. Swallow and repeat.
在另一方面 根据一项研究 狗在喝水上比猫要更
Dogs, on the other hand, are a little more gung-ho than cats, according to a separate
“同心协力”
study.
这项研究表明狗把舌头伸进碗里把水溅起像长条状之后
These researchers found that dogs splash their tongues deeper into water bowls, curl them
会快速地以每秒700厘米甚至更快的速度缩回
into more of a ladle-shape, and then can retract them at speeds of 700 centimeters per second
舌头
or more.
这意味着狗的舌头是直接搅动了整碗水 所以在狗真正喝到水之前
This means more of a dog’s tongue is touching the water, so dogs end up making a bigger,
他们总会把喝水碗附近弄得一团糟
messier water column before they clamp their mouths shut.
狗狗越大只 舌头也越大 意味着喝水碗附近也更乱
The larger the dog, the larger the tongue, and the larger the splash.
所以下次你的狗把喝水碗附近弄得一团糟的时候 你可以把锅推给物理学
So next time your dog makes a mess at the water bowl … you can blame physics.
感谢你们的提问 更加感谢那些在Patreon上一直为我们作出解答的
Thanks for asking, and thanks especially to all our patrons on Patreon who keep these
热心人
answers coming.
如果你想提出问题要我们解答 或者想要比其他人更早地看到我们的视频
If you’d like to submit questions to be answered, or get some videos a few days early,
请前往patreom.com/scishow
go to patreon.com/scishow.
还有别忘了在youtube.com/scishowd上点订阅哦
And don’t forget to go to youtube.com/scishow and subscribe!

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