科比和考芙首先对一群大鼠新生3天的神经元进行标记，接着在两周后让这些大鼠建立了一个恐惧性条件反射。
Kirby and Kaufer labeled hippocampal cells created over a three-day period in a group of rats, and then conditioned a fear response in these rats two weeks later.
不幸的是，要想标记出一大群动物的行为几乎是不可能的。
Unfortunately, it is impossible to tag more than a few individuals in a herd, flock or swarm.
受福尔摩斯故事启发，朗和一群志愿者用一些能说明穿戴者身份的线索为博物馆标记了历史服装。
Inspired by the Holmes stories, Long and "an army of volunteers" scoured the museum's archives for historical garments with tell-tale clues to the wearer's identity.
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