从另一方面来说，如果大多数的巴多胺感受器处于空闲，那么放射性物质将会继续依附其上。

If most of their dopamine receptors were free, on the other hand, the radioactive substance would bind to them.

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视网膜光感受器放射状伸展，形成黄色环状。

Stage 1b: Lateral spread of retinal receptors, yellow ring.

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