[经] fluctuating effective rate of return

bō dòng xìng shí jì bào chóu lù ㄅㄛ ㄉㄨㄥˋ ㄒㄧㄥˋ ㄕˊ ㄐㄧˋ ㄅㄠˋ ㄔㄡˊ ㄌㄨˋ