这台机器是由电力推动的。
正如人需要水份滋润，社会有赖电力推动繁荣。
People depend on water the same way society relies on electricity to prosper.
即便有了最理想的技术之一——电力推动系统，我们仍需加以区别。
Even with electric propulsion systems, certainly one of the most promising technologies, a distinction needs to be made.
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