Keratoprotein constitutes hair, nail, feather, silk and cobweb.
角
构成毛发、
甲、羽毛、蚕
网。
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人 Science and technology Crash Course A sheet of particles like the proteins that make up silk is a more sophisticated kind of network because the particles are connected on all sides, but its connections are still two-dimensional so it's only stronger in those directions.
像构成蚕丝的蛋
质这样的粒子薄片是一种更复杂的网络固体，因为这些粒子四
，但其接仍然是二维的， 所以它只在那些方向上更强。
