第二个can修饰的后面的our reactions to the behavior of our friends.跟前面第一个can修饰a customer's mood一样。后面的CAN是倒装,你把句子的顺序变一下就容易明白了。in one sence the effect of a customer's mood can be thought of, just like our reactions to the behavior of our friends can "ALSO" be thought of....