但科学家们观察到，不同于那些通常是爬行动物捕食对象的昆虫，一种特殊种类的昆虫却以蛇类和龟为食。
But unlike insects that often fall prey to reptiles scientists have observed one particular species of bug eating snakes and a turtle.
设计：以细胞为观察对象的重复观察测量，对照性体外实验。
DESIGN: Controlled experiment in vitro with repeated observation and measurement based on cells.
设计：以动物为研究对象，观察、验证性研究。
DESIGN: Observational and experimental study based on animals.
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