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。
A secondary structure in proteins, relatively flat and formed hydrogen bonding between two parallel or anti-parallel stretches of polypeptide.
来自光源（1）的光线的轴线以及反向 散射到光检测器（3）的光线的轴线具有彼此紧邻并基本平行或重合的 部分。
The axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions.
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