To get an accurate sample of an event that takes, for example, 20 seconds, samples must be measured every 10 seconds according to the Nyquist theorem.
例如，根据奈奎斯原理，为了得到发生时间为20秒的事件的准确样本，那么必须每10秒进行一次抽样。
In China, you can always set your watch accurate to the seconds.
在中国，你总可以将你的手表设定精确到秒。
In China, you can always set your watch accurate to the seconds.
在中国，你总可以将你的手表设定精确到秒。
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