求翻译：Pavlov demonstrated that if a bell was rung immediately prior to giving a dog food, the dog would eventually salivate as soon as the bell was rung, before it saw the food. Salivation to a bell is not a natural, but a conditioned reflex. Therefore the bell is a conditioned stimulus and salivation to the bell is a conditioned response. Pavlov termed this classical conditioning or reflex learning and it takes place at a subconscious level. This classic conditioning theory enables health professionals to understand the development of many fears and phobias. The arachnophobic views the spider (stimulus) as anxiety-provoking and leads to panic in the presence of a spider (response).是什么意思？

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