The second reason is that it is difficult to make these circuit voltage controllable over a large frequency range.

第二个理由是很难做到将这些电路的电压控制在一个很大的频率范围内。

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It's a difficult circuit that rewards skill over horsepower, and to win at Monaco is a highlight of any driver's career.

这是艰难的一条赛道，需要车手有卓越的技能，能赢得摩纳哥站的比赛是所有车手职业生涯的亮点。

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The light arrives at a low angle, however, as the Sun makes a daily circuit around the horizon, and icebergs cast long shadows over the surrounding sea ice.

然而，当太阳每天沿着着地平线转动时，阳光只能以很低的角度到达南极大陆，将这里的冰山制造出长长的影子，投射在周围的海冰之上。

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Oram and Lowe developed the lead characters on the comedy circuit over several years.

BBC: Broken wins top prize at British Independent Film Awards

"We wish to thank Mr Gill for his work at the circuit over the past 18 months in which we secured the prestigious British Grand Prix, " added Gillett.

BBC: Donington submits new track plans

Circuit busy over the past several years.

FORBES: D.C. Circuit to EPA: Rules Must be Neutral, Not Aspirational