[天经地义 / 天經地義, tiān jīng dì yìㄊㄧㄢ ㄐㄧㄥ ㄉㄧˋ ㄧˋ] lit. heaven's law and earth's principle (成语 saw); fig. right and proper; right and unalterable; a matter of course#28703
[とうぜんのことながら, touzennokotonagara] (exp) naturally; not surprisingly; it should be appreciated that; understandably; as a matter of course; as is obvious; as will be understood