Humans, like rats, can be trained in alaboratory to fear an innocuous stimulus—a sound or a color—by pairingit with a shock.

人类如同白鼠一样都可以在实验室里训练至害怕一种无害的刺激——一种声音或者颜色——同时给予电击即可。

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To read words that are new to us, we have to learn to associate a visual stimulus (a letter, or grapheme) with its corresponding auditory stimulus (the sound, or phoneme).

要认识新字，我们必须把视觉刺激(字母或字符)与其相应的听觉刺激(声音或音素)联系起来。

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The new study tested how fetuses in nearly 100 pregnant women responded to a specific stimulus, in this case, a "vibroacoustic stimulation, " which is a very low sound that makes a vibration.

新研究测试了近100个孕妇的胎儿对特殊刺激的反应，在这情况下，“声刺激”，一种有振波很低的声。

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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。

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