停顿一秒，先试问自己这样的一些简单的问题：“我怎么会知道事情是不是真是这样的呢？
By stopping and asking ourselves a few simple questions: “How do I know if that’s really true?
他们的论文揭示出引起点头的因素有很多，并不是简单的音调的降低或者停顿。
Their paper reveals that there is much more to eliciting a nod than simply lowering the pitch of the voice and pausing.
此程序运行后，请生成一些简单的口哨声——稳定的单音调或具有1-3-2停顿的音调。
Once the program is running, generate some simple whistles — separate solid tones or rising-scale notes with one-third-second pause between.
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