Vensim PLE is fully functional system dynamics software that is free for personal and educational use, is shareware for commercial use, and comes complete with sample models, help engine, and Adobe Acrobat format PLE User's Guide.可放心的将PLE用于科学研究，是免费的。
Vensim PLE is fully functional system dynamics software that is free for personal and educational use, is shareware for commercial use, and comes complete with sample models, help engine, and Adobe Acrobat format PLE User's Guide.
可放心的将PLE用于科学研究，是免费的。