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GroundHog 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。
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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