[经] fluctuating effective rate of return
biàn dòng de shí jì yíng lì lù ㄅㄧㄢˋ ㄉㄨㄥˋ ㄉㄜ˙ ㄕˊ ㄐㄧˋ ㄧㄥˊ ㄌㄧˋ ㄌㄨˋ
变动的实际盈利率