by the by是什么意思？

By the by, he is not my son.顺便提一句, 他不是我儿子.Land, sea and air, car, even by the by, singular, human know to man.陆, 海,空, 汽车, 甚至是, 奇异, 人类知道的人....

by the by的音标：by the by的英式发音音标为：[bai ðə bai]by the by的美式发音音标为：[baɪ ði baɪ]...