potential 如何处理好? 回复 1# lincqh roi 是投资回报率 “ performance measure used to evaluate the efficiency of an investment or to compare the efficiency of a number of different investments. to calculate roi, the benefit (return) of an investment is divided by the cost of the investment; the result is expressed as a percentage or a ratio.” http:///terms/r/returnoninvestment.asp 之前我说的不确切,再查了一下,payback表示的是投资回收,即投资与回报对等的情况, 正如lincqh所说,如果payback有单位的话,那么在这里应该就是投资回报期 payback period的简称了。^^~ http:///wiki/payback_period 介绍比较详细查看更多