Luckily, back in June of 1993, our unidentified visitor went away, but other families were so much less lucky, and that was the thought that motivated my research.
很幸运的，1993年六月那次 门外的身份不明的到访者最终离开了， 但是其他的家庭远没有那么幸运， 也正是这个想法激发了我的研究。