故事发生在大约半个世纪以前。
然而，第一个慢性中毒病例发生在半个世纪以前。
However, the first chronic case took place half a century ago.
她是英国人，在那时--半个世纪以前，她成为我们这个爱尔兰海滨小镇的“外星人”。
She was English, which in those days — we are speaking of half a century ago — made her an exotic species in our little Irish seaside town.
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