这种符号即是一种荣耀也是作为某个部落的成员标记（身份证啊）——每一个部落的标记都是独一无二的，而且只有群员才能使用。

This mark is both a symbol of respect, and a sign of membership of a certain Clan - each mark is unique to a particular Clan, and used only by this group.

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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.

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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.

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