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地球上为何会出现吸血生物？
source link: https://tech.sina.com.cn/d/a/2019-12-11/doc-iihnzhfz5052677.shtml
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新浪科技讯北京时间12月11日消息，据国外媒体报道，位于加拿大多伦多的皇家安大略博物馆近日收到了两台巨大的冷柜，其中盘旋着几条活生生的七鳃鳗。这种生物形似鳗鱼，可用牙齿刺破其它鱼类的皮肤，然后将猎物的血液和体液吸食殆尽。工作人员们戴上厚厚的
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