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More than the physical reality of photons or sound waves, perception is a product of the brain.

与光子或声波的物理实体不同，感知是大脑的产物。

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The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

And what this is in a very general sense is the learning of an association between one stimulus and another stimulus, where stimulus is a technical term meaning events in the environment like a certain smell or sound or sight.

一般来说,经典条件作用是指在一个刺激,和另一个刺激之间形成联结，这里的刺激是一个专业术语,意思是环境中出现的事件,比如某种味道，声音或景观。

耶鲁公开课 - 心理学导论课程节选

Before long the speaker realizes that this fantasy is starting to sound a little extreme or maybe a little dangerous.

不久之后诗歌发言者意识到,这个幻景,开始听起来有点过头或危险了。

耶鲁公开课 - 弥尔顿课程节选

Gen McKiernan did not look or sound like a man of the "Yes We Can" school.

BBC: When generals become unstuck

Without the right experience or sound counsel, getting it right can require considerable energy and effort.

FORBES: Docking: New-Age Brand Licensing

This counterproductive approach will result in your getting zero quotes, or sound bites, in a story.

FORBES: The Quotable Example -Media Training