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1·Soon they were dead, victims of a mysterious poisoner.

不久他们就死了，是被一个神秘投毒者害死的。《柯林斯英汉双解大词典》

2·Rumours of a possible animal poisoner were reinforced by claims that a woman was seen near Kim's enclosure shortly before she died.

关于有人给动物下毒的谣言越来越多，有人称看到一个女人在Kim死前一会儿离笼子很近。