我們經常收到研究关于不用外力的“自動”水車問題的來信和來稿。有的不僅是有了這種幻想,而且費了很长的時間與不少金錢去鑽研這種“自動水車。他們的熱情與鑽研精神是值得欽佩的,但是時間與金錢總是白白浪費了。這篇文章是從原理上來說明:不用外力的自動水車是不可能成功的,希望能夠通過這篇文章使正在研究與想研究這種自動水車的同志有一個正確的認識並转移研究方向。 We often receive letters and submissions on the issue of “automatic” waterwheels that do not use external forces. Some have not only had such illusions, but also spent a long time and a lot of money to delve into this kind of "automobiles. Their enthusiasm and spirit of study are admirable, but time and money are always wasted. This article explains in principle that an automatic water wheeler without external force cannot be successful. I hope that through this article, I can make a correct understanding of the comrades who are studying and want to study this automatic water wheel and shift the research direction.