请问is that of 比如说 Its principal function is that of providing safety from predators
问题描述：
请问is that of 比如说 Its principal function is that of providing safety from predators
比如说 Its principal function is that of providing safety from predators,partly because if one bird reacts to danger,the whole flock is warned
答
is that of 可以意为“就是”的意思.在句子中起解释说明的作用,用于连接句子.