In addition to the word "show" on the tombstone, there is also the word "first", which is more particular. In other words, "obvious" and "first" cannot be used indiscriminately, and each has its own emphasis. "Xian" requires that there are no living elders above the deceased and grandchildren below, so the word "Xian" can be engraved on the tombstone. There is no requirement for "first", and "first" can also be used if it does not meet the "obvious" conditions.
"Examination" and "obedience" are easy to distinguish. There is an idiom called bereavement, which means that people are as sad, very sad and anxious as their dead parents, and it is often used as a derogatory term. Naturally, "Kao" and "Cong" represent father and mother respectively. Among them, the word "Kao" stands for father, which is a monument erected by son or daughter to father, and the word "Yan" stands for mother, which is a monument erected by son or daughter to mother. These two words are also essentially different, and they are also very particular about using them. They cannot be used wrongly.