kē xué jiā / cóng / hòu yú / de / xuè yè / zhōng / tí qǔ / chū / le / tè shū / de / jiǎn cè / shì jì科学家从鲎鱼的血液中提取出了特殊的检测试剂。Scientists extract a special detection reagent from the blood of horseshoe crabs.