A secondary structure in proteins, relatively flat and formed hydrogen bonding between two parallel or anti-parallel stretches of polypeptide.
蛋白质的一种二级结构，相对平坦，在两条平行的或反向平行的肽段之间形成氢键。
2
The research results showed that the strength properties of recycled paper were improved mainly by enhancing the bonding properties of the secondary fibers.