：书中内容来自网络各大论坛，经ntiq 整理成电子书，希望对部分刚刚进入科研工作岗位的朋友有所帮助，则心愿已足！本书可转载，请注明出处！部分内容收集后已记不清出处，请原作者谅解！-: The book content from major networks forum, by ntiq organized into e-books, I hope for some scientific research work has just entered a friend help, then aspiration is enough! This book may be reproduced, please indicate the source! Part of the contents of the collection has not remember the source, please original author of Understanding!