Why is complex data wrapped inside an intermediate type?

为什么要把复杂数据包装在中间类型中呢？

youdao

So much of my time these days is spent wrapped inside a cocoon of non-understanding.

所以在那些日子里，很多时候我是被包裹在稀里糊涂的蚕茧中。

youdao

After the toolbar, you have a simple HTML form wrapped inside an unordered list.

有了工具栏之后，您就有一个封装在无序列表之内的简单HTML表单。

youdao

Inside lay Roaring Camp's newest citizen, wrapped in a piece of bright red cloth.

VOA: special.2009.06.06

Even if it comes wrapped inside a Deluxe Super Large Pain in the Ass.

FORBES: What's Worse? A Royal Pain or Mr. Lacks Commitment?

The inside was wrapped with eight inches of insulation and several layers of plastic, he said.

CNN: Inside the bunker: From storm shelter to boy's prison

Inside, wrapped in unlaundered T-shirts and dog-proof layers of plastic, was half a pound of Turkish hashish.

NEWYORKER: Hand on the Shoulder