You can fold it in half just like closing a book.

你可以像合书一样把它对折。

youdao

The first time you fold it in half, it becomes 150 mm long and 0.1 mm thick.

第一次折叠后，它会变成150 mm长，0.1 mm厚。

youdao

If your pillow does not bounce back into its shape after you fold it in half, it is time to replace it with a new one.

如果你的枕头在你将其对半折叠之后，不能弹回去恢复到原来的形状，那就是时候换一个新的枕头了。

youdao

If it goes on for ten years that means that the -it'll double in seven years, so it'd be going up like two and a half fold.

如果按照此速度过上十年就意味着,七年内价格将会翻倍,所以价格应该会上涨到两倍半

耶鲁公开课 - 金融市场课程节选

To demonstrate, take the current iPhone 5, lengthen it by 1.5 inches, widen it by an inch, make it 30% thinner, then fold the whole thing in half.

FORBES: Apple's Folding Future