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So, what happens is the UCS and the CS, the bell and the food, go together because they happen at the same time.
发生的事情不过是,无条件刺激与条件刺激，铃声与食物，因为恰巧同时出现而联系在了一起。
应用推荐
$firstVoiceSent
- 来自原声例句