爱、采 ( A trivalent verb takes 2 objects )
一价动词(动1):

This is intransitive verbs, which means, verbs that cannot have an object attached to them. 

Example: 我病了。 -> I am sick. (No object and cannot have an object)

二价动词(动2):

This is transitive verbs, verbs that can have objects attached to them.

Example: 我爱你。 -> I love you. ("you" is the object)

三价动词(动3):

Also called 双宾动词 and 授与动词，meaning verbs that can have an object and a receiving or benefiting target(i.e. equivalent to "to" in English or 给 in Chinese).

Example: 我送了礼物给我哥哥。 -> I gave presents(object) TO my brother(benefited target).