Secondly, the author summarizes the descriptions on NFLVR for several decade years, and gets four descriptions which are the most representative and comprehensive.
其次对近几十年来有关NFLVR的描述作了归纳总结，得到最有代表性以及应用最广泛的四种描述。
Secondly, the author summarizes the descriptions on NFLVR for several decade years, and gets four descriptions which are the most representative and comprehensive.
其次对近几十年来有关NFLVR的描述作了归纳总结，得到最有代表性以及应用最广泛的四种描述。
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