It's made from flexible proteins called crystallin.

它由有蛋白构成。

Now there are more pants with stretchy waistbands on the Stitch Fix website than buttons or zippers.

如今，在Stitch Fix网站上，有腰带裤子比有纽扣或拉链裤子还要多。

Anyway, it's the bounce that counts.

不管怎样，还是有意义。

Have you ever used those stretchy jeans that Origin makes?

你用过Origin品牌那种有牛仔裤吗？

And because it had a springy, like a rim, i would dunk it and it would chew right back into my face.

因为它边缘是有 我扣篮之后它会回我脸上。

A " fitted sheet" is a special kind of sheet that has elastic in each corner.

。 床笠是一种特殊床单， 在每个角落都有。