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，披萨店了瓦楞来做披萨盒，既可以保温，又不会让太多湿气留在盒子里。

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

在1974年，披萨盒不是由瓦楞成的，它们是非薄的成的。

All that stuff goes to these facilities where it's sorted into different materials, you know, mixed paper, corrugated cardboard, clear bottles, that all gets separated.

所有这些东西都被送到这些设施，在那里它们被分类成不同的材料，你知道，混合，瓦楞，透明瓶，所有这些都被分开。

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的残留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的桶，装混合的桶和装瓦楞的桶。