This became so popular that a playwright almost had to include it in every play, which is why it's called: the obligatory scene.

这种表演方式非常受欢迎，以至于几乎每一部戏剧的编剧都会采用它，这就是它被称为必演场景的缘由。

youdao

In some vegetables, flavors intensify as the plant matures, which is why the so-called baby versions have wider taste appeal with just as many health benefits.

一些蔬菜的味道会因为随着种植的时间加长而加重，这就是为什么虽然同样有益于健康，一些所谓“娃娃版”的蔬菜显得更加有吸引力。

youdao

Developers can quickly add extra machines when needed and shut them down if there is no demand (which is why the utility is called Elastic Computing Cloud, or EC2).

程序员有需要就可以迅速添加额外的机器，没有就关掉 （所以这个公共程序叫做弹性计算云，或者EC2）。

youdao

We used to cover a science song - in fact, we still do - called "Why Does The Sun Shine, " which is from a bunch of science - the question of science songs that came out when we were kids with Tom Glazer - and I don't know if you're familiar with this record.

NPR: Serenading Science In A New Rock Album

The bank recapitalisation was intended to help do that, which is why we called for it and supported it.

BBC: In full: Cameron's economy speech

Some equipment is donated by medical-supply companies, which explains why somewhere in the forest lives a child called Bertoni, born in the safety of a tent made by a company of the same name.

ECONOMIST: Travels among the Ticuna