ADM-201 dump PMP dumps pdf SSCP exam materials CBAP exam sample questions

爆米花的前世今生 – 译学馆
未登录,请登录后再发表信息
最新评论 (0)
播放视频

爆米花的前世今生

Popcorn Under A Microscope

信不信由你
Believe it or not,
爆米花这种广受欢迎的零食已有数千年历史
popcorn has been a popular snack for thousands of years.
古代中美洲人培育的第一种玉米
The very first corn domesticated by the ancient people
既不是粉玉米也不是甜玉米
of Mesoamerica wasn’t flour corn or sweet corn
而是爆玉米
They started out with popcorn.
几年前
A few years ago,
考古学家发现了大约六千年前的爆玉米粒儿
archeologists discovered popcorn cobs that were about 6000 years old.
他们认为这种高产作物促进了阿兹台克帝国的崛起
They think this high yield crop helped fuel the rise of the Aztec Empire.
而实际上阿兹台克人还有个专有词
And the Aztecs actually had a special word
来描述玉米粒爆裂的声音
for the sound of exploding kernels:
那么玉米粒爆裂的科学道理是什么?
So … what’s the science behind that pop?
呃 爆玉米的颗粒比粉玉米的小 也更硬
Well, popcorn kernels are smaller and harderthan flour corn kernels
它有着硬硬的外皮 里面包着
They have these tough shells that surround a tiny pocket
一点淀粉 也锁住了水分
of soft starch and seal in moisture
一旦加热 这些玉米粒就像一个个小高压锅
Add heat …. and the kernels act like tinypressure cookers.
包裹在里面的水温度极高
The super-heated water inside actually
让玉米淀粉发生了液化
liquefies the starch.
随着温度的升高
The temperature rises.
压力也越来越大
The pressure builds.
然后
And then:
眨眼之间 液化的淀粉就像泡沫一样
The liquified starch froths out cooling and solidifying
汩汩冒出 然后冷却 变成固态
in a fraction of a second
取出一粒玉米 在电子显微镜下
If you take one kernel and look at it very, very closely
非常非常仔细地观察
under an electron microscope
你会发现它是由一个个淀粉泡组成的
you can see that it’s made up of starch bubbles
而这些淀粉泡是由扩散的蒸汽造成的
that were formed by the expanding steam
这就是爆米花放大250倍后的样子
This is popcorn magnified 250 times
真好吃
Delicious!
我是Skunk Bear 这是NPR的科学节目
This is Skunk Bear, NPR’s science show Subscribe to our channel,
欢迎订阅本节目 收看其他视频
and check out our other videos!

发表评论

译制信息
视频概述

瓦特?几千年前就有爆米花了?什么品种的玉米可以做成爆米花?

听录译者

收集自网络

翻译译者

战五渣

审核员

审核员XY

视频来源

https://www.youtube.com/watch?v=uw29R7hU6No

相关推荐