Molecules are produced here and they flow directly over, usually by diffusion, to the neighboring molecule.

这里产生的分子,通常是以扩散的方式,直接到达临近的分子

耶鲁公开课 - 生物医学工程探索课程节选

In general, inside of a cell molecules move by a process called diffusion.

总的来说,细胞内的分子通过扩散作用来移动

耶鲁公开课 - 生物医学工程探索课程节选

It refers to usually 'receptors' that are fixed in a cell, on a cell membrane, and 'ligands' which are dispersed throughout the body and free to diffuse around, and occasionally will find the cell.

受体这个词通常代表了,固定于细胞表面的分子,而配体分散于体内各处,能够自由扩散,它们偶尔会与细胞邂逅

耶鲁公开课 - 生物医学工程探索课程节选