这种药物通过激活细胞表面的特定受体发挥作用。

This drug works by activating specific ___receptors on the cell surface.

眼睛中的光感受器帮助我们感知亮度。

The light ___receptors in our eyes help us detect brightness.

这台收音机的接收器能捕捉到很远的电台信号。

The ___receptor in this radio can pick up signals from distant stations.