The CDC doesn't monitor seasonal flu deaths as closely as it does swine flu, and has no comprehensive count of each year's flu deaths to enable such a comparison.
CDC没能像猪流感那样去监测季节流感死亡，每年能够用于比较的流感死亡数字没有综合统计。
The circuit uses IC4, a CD4069 inverter, as a reset-delay enable to cause a few milliseconds of delay before each counter can begin to count.
电路使用IC4的CD4069反相器作为复位延时使能，在每个计数器开始计数前引入几毫秒的延时。
Suppose that Enable is high, the counter counts up every clock cycle, and the frequency of the PWM output is the clock frequency divided by 2 count bits.
假设高信号使能，计数器每个时钟周期进行计数，PWM输出的频率为时钟频率的2次幂分频。
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