It's made from flexible proteins called crystallin.

它由有弹力体蛋白构成。

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，有弹力腰带裤子比有纽扣或拉链裤子还要多。

Have you ever used those stretchy jeans that Origin makes?

你用过Origin品牌有弹力牛仔裤吗？

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

因为它边缘是有弹力 我扣篮之后它会弹回我脸上。