Others are broken down by enzymes in the synaptic cleft, or sent away from the synapse by diffusion.

其他的被突触裂隙中的酶分解，或者通过扩散被送出突触。

And these two neurons communicate even though they never actually touch. Instead, there's a tiny gap called a synaptic cleft between them — less than five millionths of a centimeter apart.

这两个神经元即使从未真正接触过也会进行交流。相反，它们之间有一个叫做突触间隙的微小间隙——相距不到百万分之五厘米。

Upon arrival of neuronal impulse, synthesized acetylcholine is released into the synaptic cleft where it interacts with acetylcholine receptors located on the postsynaptic neurons.

当神经冲动到达时，合成的乙酰胆碱被释放到突触中与位于突触后神经元上的乙酰胆碱受体相互作用的裂缝。