例句與造句

1. The exhibits included a polyphase generators, step-up transformers, transmission line, step-down transformers, commercial size induction motors and synchronous motors, and rotary direct current converters ( including an operational railway motor ).
2. This system was developed into the modern 3-phase system by Mikhail Dolivo-Dobrovolsky and Allgemeine Elektricit鋞s-Gesellschaft and Charles Eugene Lancelot Brown in Europe, starting in 1889 . The simplicity of polyphase generators and motors meant that besides their efficiency they could be manufactured cheaply, compactly and would require little attention to maintain.
3. It's difficult to find polyphase generator in a sentence. 用polyphase generator造句挺難的