The next conversation, by which person input is indicated in boldface, illustrates one execution of This system with the data file orderlog.py posted With all the assignment. 数据介绍部分首先要说明数据的记录数和来源（resource、time span），这两点是必须要的。接着说明数据的完整性，是否有missing benefit、questionable documents。如果考试的数据有问题，做过哪些调整也要说明（比如删掉了哪些变... http://elliottr8a6v.total-blog.com/the-2-minute-rule-for-summary-35900774