Those receptors, some fraction of them, are specific for the ligand that the pre-synaptic cell releases.

这些受体 其中一部分,特异性地结合突触前细胞释放的配体

耶鲁公开课 - 生物医学工程探索课程节选

When they receive the signal they make - they change in a very specific way and the cell can recognize this change that's occurred at the cell surface.

当它们接收到信号之后,就会发生十分特殊的变化,细胞能够识别自身表面发生的这种变化

耶鲁公开课 - 生物医学工程探索课程节选