1, spell ru? Head: head

2, Rui, know the word. Shuowen: "From the eye, from the valley province. The empty ravine has a clear meaning. The function of "eyes" is to see clearly. Together, it is' wisdom' and' wisdom'. " Original meaning: access; Wise.

3. Related words:

Smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart, smart.