She ran four circuits of the track.

她在跑道上跑了四圈。

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Experiment results of simulating on lines with two, three, and four circuits validate the proposition. Verifications, complements and modifications are made for some of the literatures.

两回、三回、四回线路的仿真实验结果验证了命题的正确性，对部分文献结果进行了检验、补充和修正。

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Four applied circuits of NE570 are given.

文中给出了NE570的四种应用电路。

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Stoner, who plans to retire at the end of this season, was also disappointed -- having won the previous four races held at Spanish circuits.

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Two low-temperature cooling circuits ensure that the four electric motors and the power electronics are maintained at an even operating temperature.

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