"Ade" means "goodbye" in German. The so-called "farewell slogan" is a simple verbal call sign when saying goodbye, which is mostly used in children's language to express an intimate and casual tone. The voice is simple but full of emotion, which is irreplaceable by the formal word "goodbye". Just as "good-bye" is used to formally express "goodbye" in English, "bye-bye" is more used in children's language, and the emotional color of children's farewell is poured into the simple syllable "bye-bye", which is irreplaceable by the formal word "goodbye".

In "From Botanical Gardens to Three Tans Printing the Moon", Lu Xun deliberately borrowed the German children's language "Ade" and used it repeatedly, vividly depicting the childish attachment of young Lu Xun to small animals, plants and interesting nature. The two "Ades" can be said to have achieved a vivid artistic effect.