3.High School English Listening

So you made lasagna last night, and it was delicious.
You saved the leftovers by wrapping aluminum foil over the top of the pan, and putting it in the fridge.
When you get hungry today, you go to look for that lasagna, but it looks like the lasagna was getting hungry too!
It's eaten tiny holes in the aluminum foil that was covering it.
Why does this happen?
A listener asked this question and we'll find the answer on today's moment of science.
There are really two things responsible for those holes in the aluminum foil: the acidic nature of the lasagna and some curious properties of aluminum.
Lasagna gets most of it's acid from the tomatoes in its sauce.
Almost everything you eat is at least slightly acidic, but tomatoes are especially so.
This acid wouldn't be a problem for a glass container, or stainless steel, or plastic wrap, or for most of the materials we use to store and prepare food.
Aluminum, though, is especially vulnerable to acid.
Here's why.
Most metals form a protective layer on their surface called an oxide layer.
Aluminum forms an oxide layer too, but it is very thin, allowing the tomato's acid to easily break through.
This lets the tomato sauce dissolve the aluminum, and it creates grey or black chemicals on top of the lasagna that taste very bad.
The same thing can happen if you use aluminum cookware for acidic sauces.
Sauce made in an aluminum pot will be grayer and not as tasty as sauce made in other cookware.
译文：
你昨晚做了烤宽面条，很好吃。
你把铝箔包在锅的顶部，并把它放在冰箱里，从而保存了剩余的食物。
当你今天饿了的时候，你去找那个千层面，但看起来千层面也饿了！它把铝箔上的小洞吃了。
它在覆盖它的铝箔上吃出了小洞。
为什么会出现这种情况呢？
一位听众问了这个问题，我们将在今天的科学时刻找到答案。
造成铝箔上这些洞的原因其实有两个：烤宽面条的酸性和铝的一些奇怪的特性。
千层面的大部分酸性来自其酱汁中的西红柿。
几乎所有你吃的东西都至少是微酸的，但西红柿尤其如此。
这种酸对玻璃容器、不锈钢、保鲜膜或我们用来储存和准备食物的大多数材料来说都不是问题。
然而，铝却特别容易受到酸的影响。
原因就在这里。
大多数金属在其表面形成一个保护层，称为氧化层。
铝也形成了一个氧化层，但它非常薄，使番茄的酸可以轻易地突破。
这让番茄酱溶解了铝，并在千层面上产生灰色或黑色的化学物质，味道非常糟糕。
如果你用铝制炊具做酸性酱料，也会发生同样的事情。
用铝锅做的酱汁会更灰暗，不像用其他炊具做的酱汁那样美味。
重点词汇：
lasagna 千层面
last night 昨晚 ; 最后一夜
aluminum foil 铝箔
over the top 夸张的;言过其实的 ; 盖上
go to 去… ; 费工夫；花钱 ; 求助于；求教于
look for 寻找 ; 探索 ; 渴望 ; 盼望
There are 有 ; 可数名词的复数形式 ; 许多重要事情要谈
responsible for 负责 ; 是造成…的原因
most of 大多数