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。
2
An LCD does not emit light of its own. Rather, it consists of crystal molecules. Anelectric field causes the molecules to line up in a way that alters their optical properties.