在VFP6下的自用背单词程序, 有支持记忆曲线. 但由于仅用于简单背单词功能, 对一些改进的地方还没有写的很完整.-In under-occupied VFP6 word back procedures, supporting memory curve. However, due to back word used only for simple functions, a number of improvements have not yet written a very complete.