The conditioned response, once it is firmly established, can be extinguished dozens of times, but it will always return, like the proverbial bad penny.是什么意思_The conditioned response, once it is firmly established, can be extinguished dozens of times, but it will always return, like the proverbial bad penny.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句