A separate report in December said the number of men and women dying of cancer in the United States had dropped for the first time on record.

VOA: special.2009.03.02

Now what we do is to record the number of those action potentials in some period of time, and plot them on the graph below.

现在，我们要做的是记录,在一定时间内可能做出的动作，在图表中设计出来。

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