It's wrapped in 24 layers of corrugated cardboard, which makes it light and just about sound-proof.

它由24层瓦楞包裹，这样既轻便又隔音。

Eventually, corrugated cardboard struck a fine balance between retaining heat without trapping too much moisture.

最后，披萨店就采用了瓦楞来做披萨盒，既可以保温，又不会让太多湿气在盒子里。

In 1974 pizza boxes were not made of corrugated cardboard, they were made of very thin cardboard.

在1974年，披萨盒不是由瓦楞制成，它们是用非常薄制成。

It's made from recycled content, mostly recycled shipping corrugated boxes.

它由回收材料制成，主要是回收运输瓦楞箱。

That cardboard and paper is sorted by workers who remove any remaining contaminants, or stray plastics, and separated the materials into bins for newspaper, mixed paper, and corrugated cardboard.

瓦楞和张通过人工分类把其中残污染物和塑料碎片除去，然后把它们按材料分别投入装废旧报桶，装混合桶和装瓦楞桶。