Humans striving for rationality but restricted within the limits of their knowledge develop working procedures that partially overcome these difficulties.
人们为了理性而努力，但总是被局限于他们知识的限制之中，于是人们开发出工作程序从而部分地克服这些困难。
From the point of view of design, puts forward method to develop the ventilator operating within the limits of load.
并提出从电机设计方面实现限载型通风机的方法。
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