The third, and most potent limitation is that it is not possible to be certain that the infant's response was due to the stimulus presented or to a change from no stimulus to a stimulus.
第三也是最有力的限制在于婴儿做出的是面对刺激的反应,还是从受到刺激到没受到刺激的变化,这是无法确认的。
The change in volume rapidly-it's called 'rough' in acoustics-most people's ears don't like that stimulus.
音量迅速改变——声学中称为‘粗’——大部分人不喜欢那种刺激。
Economic stimulus policies demands change as well.
经济刺激政策也应调整。
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