Like many other agents that affect neuron firing, adenosine must first bind to specific receptors on neuronal membranes.
像许多其他影响神经元放电的物质一样，腺苷必须首先与神经元膜上的特定受体结合。
The first test firing took place in 1940, in Fort Cronkhite, north of the Golden Gate Bridge.
第一次试射发生在1940年，地点在金门大桥以北的克朗凯特炮台。
Each side accuses the other of firing first into populated areas.
各方都谴责对方首先向居民区开火。
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