Three phase wiring saves 50 % of power compared with one - phase.

三相电源比单相电源可省电逾50%之多.

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This one phase lasts about 3 weeks.

这一阶段大约持续3周.

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As two clocks precess in phase, problems may occur at only one phase relationship.

两个时钟产生相位, 问题也许就出现在相位关系上.

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The problem at that time very clear, what is the mode of below one phase?

当时的问题很清楚, 下一阶段的模式是什么?

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It is widespread in practice that three - phase asynchronous electrical machinery runs in one - phase electrical network.

三相 异步电动机,接在 单相 电网中运行,在实际应用中较为普遍.

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