Credit: Alex Perry/Mashable
In general, there probably isn't a simple, mechanical rule to prove that a
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Such a motor is great if you want to spin a fan, for example, because it functions well at high speeds with low torque.
但问题就在这里：它是一个缺乏本体（Ontology）的工具。也就是说不知道自己是谁，没有自我角色认知。