[经] permanent filing of working paper

gōng zuò dǐ gǎo yǒng jiǔ cún dàng ㄍㄨㄥ ㄗㄨㄛˋ ㄉㄧˇ ㄍㄠˇ ㄩㄥˇ ㄐㄧㄡˇ ㄘㄨㄣˊ ㄉㄤˋ