文献法节省时间、金钱，而且效率高。文献调查是在前人和他人工作成果的基础

Documentation methods save time, money, and are efficient. Literature surveys are conducted on the basis of the work of predecessors and others, and are a shortcut to acquiring knowledge. It does not require a large number of researchers and specialized equipment, and can obtain more information with less manpower, money and time than other survey methods.

Literature method saves time, money and high efficiency. Literature survey is based on the work achievements of predecessors and others. It is a shortcut to obtain knowledge. It does not need a large number of researchers and special equipment, and can obtain more information with less manpower, capital and time than other survey methods.

Literature method saves time and money, and has high efficiency. Literature investigation is based on the work of predecessors and others, and it is a shortcut to acquire knowledge. It does not need a large number of researchers and special equipment, and can obtain more information with less manpower, money and time than other investigation methods.