In that experiment, Ledoux conditioned rats to fear a bell by ringing it in time with anelectric shock until the rats froze in fear at the mere sound of thebell.
试验中，勒杜按时闹铃并且电击老鼠直到它们一听到铃声就吓得僵住。
The telephone rang in the middle of his important experiment. He ignored the persistent ringing, thinking that any important message would reach him sooner or later.
一项重要实验做到一半时电话铃响了。他对持续不停的铃声置之不理，心想要是有重要的事他迟早总会知道的。
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