[经] customary's credit rating
gù kè xìn yòng píng dìng de děng jí ㄍㄨˋ ㄎㄜˋ ㄒㄧㄣˋ ㄩㄥˋ ㄆㄧㄥˊ ㄉㄧㄥˋ ㄉㄜ˙ ㄉㄥˇ ㄐㄧˊ