子供は３歳までに一生分の親孝行をする

こどもはさんさいまでにいっしょうぶんのおやこうこうをするkodomohasansaimadeniisshoubunnooyakoukouosuru

expression

1. children pay back their debt to their parents in full by age 3 (through their cuteness)

Study it in Yanamino