绒毛膜上的胶原组成了三角形的落选分子结构。
The collagen in the serosa is made up of a triple helix molecular structure .
这里的红色三角形代表这些小分子,当细菌独处时,分泌的小分子游离开来,所以不发光。
and these are the red triangles , and when the bacteria is alone the molecules just float away and so no light .