... ground-return link 大地回流环路 ground-return system 大地回路制 ground-return current 大地返回电流 ...
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The following code will stub the system class Date to always return the same date, say Ground Hog Day, as in Listing 6.
下面的代码对系统类 Date 进行 stub 以便总是返回相同的日期，比如 Ground Hog Day，如清单 6 所示。
When a HVDC system operates in ground-return mode, some problems such as noise rising significantly, overheating etc. occur in AC transformers, or even some transformers would be damaged.
HVDC系统以大地回路方式单极运行时，其大地回路直流会给交流变压器带来一些问题，例如，变压器噪音明显增大，过热现象，甚至引起变压器损坏。
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