It's the way, for example, that foreign molecules or antigens get presented to cells of your immune system in order to start the process of making an immune response, so sometimes a cell/cell interaction.

通过这种方式,外源分子,或者说抗原,进入到免疫系统的细胞中后,就会开启免疫反应过程,有时候就是细胞之间的相互作用

耶鲁公开课 - 生物医学工程探索课程节选

In order to have DNA you have to make DNA and your cells are continually making DNA inside your body, through a process of DNA synthesis and that synthesis is occurring because of the presence of an enzyme, a protein called DNA polymerase.

为了使每个细胞都具有DNA,身体通过一个叫做DNA合成的过程,不停的生产DNA,这个合成过程是在,一种酶的催化下进行的,这种酶叫做DNA聚合酶

耶鲁公开课 - 生物医学工程探索课程节选